单项选择题

I expect all the mails ______ promptly.

A. being delivered
B. to be delivered
C. having been delivered
D. to have been delivered
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单项选择题
The manager insisted that the chief engineer ______ testing the new model immediately.
A. start
B. starts
C. started
D. will start
单项选择题
Judging from the latest information, you’d better make up your mind now ______ it is too late.
A. after
B. since
C. when
D. before
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