单项选择题

It's high time we ______ something to stop road accidents.

A) did
B) are doing
C) will do
D) do
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单项选择题
______, he would feel exhausted after a whole day's work.
A) Strong as is he
B) Strong as he is
C) As he is strong
D) As strong is he
单项选择题
By the time you get there tomorrow, they ______ for Beijing.
A) will have left
B) are leaving
C) will leave
D) are to leave
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