单项选择题

Tom found ______ very hard to get high marks.

A．it
B．this
C．that
D．which
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单项选择题
I' ve heard him ______ about you often.
A．spoke
B．speaks
C．speak
D．speaking
单项选择题
______ , a friend of Mr. White found the wallet he had lost three days before.
A．Especially
B．Usually
C．Generally
D．Fortunately
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