单项选择题

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

A．must go
B．must have gone
C．may be going
D．could have gone
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单项选择题
______ George loves his daughter, he is strict with her.
A．Even
B．Although
C．For
D．Whether
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．in question
C．out of control
D．ill at ease
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