Students  should ______ to choose their own uniforms.
#44721
A
allow
B
allowed
C
are allowed
D
be allowed
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Thanks to the Internet, different kinds of information        in a short time.
#44436
A
can be learned
B
has been learned
C
can learn
D
has learned
The river smells terrible. People_______ dirty things into it .
#44850
A
must stop to throw
B
must stop from throwing
C
must be stopped to throw
D
must be stopped from throwing