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
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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
单项选择题
__ is not clear.
A．That he will come
B．He will come
C．Whether he will come
D．If he will come
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