单项选择题

______ is known to all, China is a developing country.

A．What
B．As
C．which
D．That
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单项选择题
It's high ______ you stopped smoking all those cigarettes.
A．sense
B．time
C．opportunity
D．reason
单项选择题
She was so touched by his kind offer that for a moment she was ______ for words to express her thanks.
A．at a loss
B．iii at ease
C．in question
D．out of control
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