It’s essential for citizens to know that the haze(雾霾.can do harm ________ people’s health.
#47125
A
with
B
for
C
on
D
to
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There are many tall trees _____ our classroom.
#50349
A
in the front
B
in front
C
in front of
D
in the front of
Tom didn't go to school_______ this morning because he overslept.
#50752
A
at once
B
on time
C
by accident
D
at present