单项选择题

He ______people with less knowledge than he has.

A．looks up
B．looks down upon
C．looks at
D．look after
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单项选择题
______, a friend of Mrs. Black found the watch she had lost two days before.
A．Especially
B．Usually
C．Generally
D．Fortunately
单项选择题
We were talking about the American tourists ______we met during our trip to the Great Wall．
A．what
B．which
C．whom
D．whose
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