单项选择题

Many ______ trees should be planted on the mountains.

A． thousand
B． thousand of
C． thousands of
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单项选择题
—Who told you to clean the windows—Father. He said they are too dirty.
A． told
B． had told
C． did
单项选择题
It's hard ______ a job.
A． tolook for
B． to find
C． to find out
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