I have great trouble ___ the math problem,can you help me?A.work _英语解答

I have great trouble ___ the math problem,can you help me?
A.work out
B,working out
C.worked out
Dworks out

人气：296 ℃　时间：2019-10-26 20:51:08

解答

B
分词短语作状语.
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