单项选择题

After ______ seemed an endless wait, it was her turn to step into the doctor's office.

A. it
B. that
C. what
D. which
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单项选择题
The workers are practising ______ a new song for the coming evening party of the New Year's Eve.
A. to sing
B. to be singing
C. singing
D. being sung
单项选择题
The students expected there ______ more reviewing classes before the final exams.
A. is
B. being
C. have been
D. to be
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