The problem is not easy_____.A.to explain B.to be explain C.explaining D.explained 请解释为什么选你所选的答案.

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The problem is not easy_____.A.to explain B.to be explain C.explaining D.explained 请解释为什么选你所选的答案.

The problem is not easy_____.A.to explain B.to be explain C.explaining D.explained 请解释为什么选你所选的答案.
The problem is not easy_____.
A.to explain
B.to be explain
C.explaining
D.explained
请解释为什么选你所选的答案.

The problem is not easy_____.A.to explain B.to be explain C.explaining D.explained 请解释为什么选你所选的答案.
A
在这种结构中to之后explain的宾语是很明确的(就是PROBLEM)
所以用主动就行了

A.It is not easy to explain this problem=The problem is not easy to explain