The way he thought of _________ the problem is very useful.A．solvingB．to solveC．_刷题宝

题干

The way he thought of _________ the problem is very useful.

A．solving	B．to solve
C．solve	D．answering

上一题下一题 0.4难度单项选择更新时间:2017-07-13 01:44:00

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