单项选择题

The atmosphere is as much a part of the earth as ______ its soils and the water of its lakes, rivers and oceans.

A．do
B．has
C．is
D．are
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单项选择题
It is high time we ______ this practice.
A．stop
B．stopped
C．have stopped
D．had stopped
单项选择题
The teacher ______ the students clean the laboratory.
A．asked
B．told
C．let
D．wanted
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