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單項(xiàng)選擇題

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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單項(xiàng)選擇題

You are not concentrating on which fork （）

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

單項(xiàng)選擇題

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