单项选择题

The boss demanded that the letter ______ typed today.

A. can be
B. should be
C. shall be
D. must be
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单项选择题
The leader requested that our homework ______ clearly.
A. be written
B. is written
C. was written
D. will be written
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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