My English teacher insisted that the exercises very difficult and that we it carefully.A

问题补充：

My English teacher insisted that the exercises very difficult and that we it carefully.

A. were; must finish

B. be; finish

C. were; finish

D. be; finished

答案：

A. were; must finish

B. be; finish

(答案→)C. were; finish

D. be; finished

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