单项选择题

While he was in the office, he preferred something nothing.

A．to do, to do
B．to do, doing
C．doing, to do
D．doing, to doing

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单项选择题

As __ chairman of __ committee, I declare the meeting open.

A．the, 不填
B． the, the
C．不填, 不填
D．不填, the

单项选择题

Carbon, __ is a very important part of living things on the earth, is rare on the moon.

A．what
B．that
C．which
D． it

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