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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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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In some countries traveling on public transport is a tremendous ______.
A．charge
B．amount
C．expense
D．sum
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