单项选择题

Jim said he ______ the Great Wall before.

A．visited
B．had visited
C．has visited
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单项选择题
Lucy knew nothing about it ______ her sister told her.
A．because
B．until
C．since
单项选择题
—Doctor, are you ______ it's nothing serious —Yes, he's just caught a cold.
A．afraid
B．ready
C．sure
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