单项选择题

It"s time that we ______ to take care of our own house.

A．begin
B．will begin
C．have begun
D．began
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单项选择题
The old man ______ dead in the snow the next morning.
A．found
B．was found
C．was finding
D．had found
单项选择题
Sheridan Community Schools consists of ______ schools.
A．two
B．three
C．four
D．five
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