單項(xiàng)選擇題

He was（）the preparation of an international conference when I arrived in Beijing.

A.engaged to
B.engaged for
C.engaged on
D.engaged in

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單項(xiàng)選擇題

The population of the earth（）increasing fast. One third of the population here（）workers.

A.is;are
B.is;hasbeen
C.are;is
D.is;was

單項(xiàng)選擇題

He, as well as I,（）a student.

A.be
B.am
C.are
D.is

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