If (如果) you have problems (问题)，you can ask Tom _____ help.
#47385
A
to
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on
C
for
D
in
推荐题目
---Let’s go hiking ___________ staying at home , shall we? ----A good idea.
#51251
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as well as
B
in order to
C
instead of
D
in addition to
Nanjing is a beautiful city. It won “China Human Habitat Environment Prize” ______ 2008.
#50222
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at
B
on
C
in
D
by