单项选择题

The teacher ______ the students clean the laboratory.

A．asked
B．told
C．let
D．wanted
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单项选择题
Jean didn't have time to go to the concert last night because she was busy ______ for her examination.
A．to prepare
B．to be prepared
C．preparing
D．being prepared
单项选择题
It is known that solar power can ______ electric energy.
A．convert into
B．convert to
C．be converted into
D．be converted to
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