单项选择题

There were many people in this city who ______ their environment.

A．take care
B．care about
C．care to
D．care with
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单项选择题
The teacher ______ the students clean the laboratory.
A．asked
B．told
C．let
D．wanted
单项选择题
Our country has grown rich because of its ______ with other nations.
A．commerce
B．commerces
C．commercial
D．commercials
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