【題目】---_______ the farmers discovered the entrance to the secret cave in the valley?

--- Totally by chance.

A. When was it B. How was it

C. How was it that D. When was it that

【答案】C

【解析】解析強(qiáng)調(diào)句型，強(qiáng)調(diào)How, that不能丟。It be ....that..

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