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
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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
单项选择题
He ______ violin when I want to sleep.
A. always plays
B. play always
C. is always playing
D. always is playing
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