单项选择题

After ()seemed an endless wait, it was his turn to step into the doctor’s office.

A. it
B. that
C. what
D. there

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单项选择题
John’s score on the test is the highest in the class; ()

A. he must have to study last night
B. he must have studied last night
C. he should have studied last night
D. he should study last night
单项选择题
The gray building is where the workers live, and the white one is where the spare parts()

A. are produced
B. are producing
C. produced
D. being produced
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