单项选择题

A man cannot smile like a child, ______ a child smiles with his eyes, while a man smiles with his lips alone.

A．so
B．but
C．and
D．for
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单项选择题
Thank you for giving me a hand. I ______ in the experiment without your valuable help.
A．have failed
B．will fail
C．would have failed
D．must have failed
单项选择题
Had you followed the doctor's advice, you would be much better now. But you ______.
A．don't
B．haven't
C．hadn't
D．didn't
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