单项选择题

The teacher has his students ______ a subject report every month.

A．to write
B．written
C．writing
D．write
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单项选择题
Not a sound ______ while the professor was giving a speech.
A．the students utter
B．the students uttered
C．did the students uttered
D．did the students utter
单项选择题
Move up a little, I haven't any ______ to sit.
A．area
B．room
C．place
D．space
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