单项选择题

A secretary’s job isn’t always easy （）

A.of to do
B.to do
C.for doing
D.of doing

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单项选择题

You are not concentrating on which fork （）

A.use
B.be use
C.use to
D.to use

单项选择题

The new suspension bridge （）by the end of last month.

A.has been designed
B.had been designed
C.was designed
D.would be designed

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