2.I don’t think _____ I __________work out the problem .A.if ; can B how

问题描述:

2.I don’t think _____ I __________work out the problem .A.if ; can B how

应该是I don't think that I can work out the problem.
或者I don't know if I can work out the problem. 最接近的只能是A了 “我不知道我能否解决这个问题”