单项选择题

The teacher has his students_________ a composition every other week.

A．to write
B．written
C．writing
D．write
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单项选择题
We look forward to________ to the opening ceremony.
A．invite
B．be invited
C．having been invited
D．being invited
单项选择题
Modern plastics can______ very high and very low temperatures.
A．stand
B．hold
C．carry
D．support
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