英语(北师大版)必修3随堂演练：Unit9WheelsGrammar1

随堂操练
实时体验稳固提高Ⅰ.单句语法填空 (不多于 3 个单词 )
1．You know, I ________________ (look) for a job for three months, and this is my first interview.
答案have been looking
2．My sister ________________ (stay) in Beijing for three months last year.
答案stayed
3．The little boy is dirty all over because he ______________ (play) in the mud all the morning.
答案has played/has been playing
4．Here he is! We ____________________ (wait) anxiously for him since last night.
答案have been waiting
5．They ______________ (marry) for more than twenty years.
答案 5.have been married
6．— Did you find the missing couple in the mountain yesterday?
— No, but we ________ (try) to get in touch with then ever since.
答案与分析have been trying“从昨天到此刻我们向来在努力与
他们联系”，表示过去的动作持续到此刻还在进行，用此刻达成进行时。

7．We ________ (work) on it for several hours but we have not yet reached any conclusion.
答案与分析have been working依据but后时态，能够判断出到现在还没有得出结论，有可能还要持续下去，所以要用此刻达成进行时。

8．— You haven't got the textbook for my chemistry course yet.
—I know, and we ________ (try) to get it for the last 5 weeks.
答案与分析have been trying由for the last 5 weeks可知用达成时，再由上文“你还没有弄到化学教科书” ，能够推断we向来到当前都在想方法，所以用此刻达成进行时。

9．I won't tell the students the answer to the math problem until they ________ (work) on it for more than an hour.
答案have been working
Ⅱ.请更正划线部分的错误
1．Sorry! I'm late. How long had_you_been_waiting for me?
_______________________________________________________答案had you been waiting → have you been waiting
2．They have_been_knowing for about twenty years.
_______________________________________________________答案have been knowing →have known
3．It began to rain four days ago. It rains for four days and hasn't stopped.
_______________________________________________________答案rains →has been raining
4．I wondered if you are busy this weekend.
_______________________________________________________答案wondered →wonder/am wondering
5．Look! You are all wet. Are you cycling in the rain?
_______________________________________________________答案Are ... cycling→Have ... been cycling。