单项选择题

______ is very useful for us students______ English well.

A．This; learn
B．It; learns
C．It; to learn
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单项选择题
He ______ two thousand trees since 1985.
A．planted
B．has planted
C．will plant
单项选择题
--How long may I ______ this dictionary-- For two months.
A．borrow
B．keep
C．lend
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