Fred entered without knocking and, very out of breath, sank _________ a chair.
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A
on
B
off
C
into
D
to
推荐题目
Many Chinese universities provide scholarships for students_____ financial aid.
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A
in need
B
in honor of
C
in face of
D
in need of
In some cases，different approaches ________ the same scientific problem lead to conflicting theories.
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A
to
B
in
C
of
D
for
It wasn’t long ___ the rain stopped and the moon came out again.
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A
when
B
until
C
before
D
since