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
Our country has grown rich because of its ______ with other nations.
A．commerce
B．commerces
C．commercial
D．commercials
单项选择题
The rain was heavy and ______ the land was flooded.
A．consequently
B．continuously
C．constantly
D．consistently
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