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The reason they did that is quite clear. [ ] A.for whyB.for which C.for thatD.fo

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The reason they did that is quite clear. [ ] A.for whyB.for which C.for thatD.fo

The reason ________ they did that is quite clear.

[]

A.for whyB.for whichC.for thatD.for what

试题答案

答案:B