单项选择题

The headmaster ______ for more than two weeks.

A. has left
B. has gone
C. has been away
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单项选择题
It is much ______ to go up than it is to come down.
A. hard
B. harder
C. hardest
单项选择题
I wanted to know when they______come to see me.
A. will
B. would
C. should
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