问题
选择题
It's so difficult a question. I think he will have problems _____..[ ]
A. work it out
B. working it out
C. in working out it
D. work out it
答案
答案：B
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It's so difficult a question. I think he will have problems _____..[ ]
A. work it out
B. working it out
C. in working out it
D. work out it
答案：B