they don't know what ___the problem.
Theydon'tknowwhat___________theproblem．（）A.todoB.doC.todowithD.dowith...
They don't know what ___________ the problem．（ ）
A. to do
B. do
C. to do with
D. do with 展开
A. to do
B. do
C. to do with
D. do with 展开
1个回答
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