单项选择题

Mary ______ crazy. She burst into laughter now and then for no reason at all.

A．must go
B．may be going
C．must have gone
D．could have gone
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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．out of control
C．in question
D．ill at ease
单项选择题
If you ask them, they'll be ______ pleased to accept your invitation.
A．only too
B．rather too
C．only so
D．too much
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