It was only after he had spent several nights digging around the cross he decided to writ

问题补充：

It was only after he had spent several nights digging around the cross he decided to write to Kit Williams to find out if he was wasting his time there.

A. that

B. how

C. and which

D. what

答案：

(答案→)A. that

B. how

C. and which

D. what

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