题目内容
—This physics problem is too difficult. Can you show me , Li Lei?
—Sure.
—Sure.
[ ]
A. what to work it out
B. what to work out it
C. how to work it out
D. how to work out it
C
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题目内容
A. what to work it out
B. what to work out it
C. how to work it out
D. how to work out it