【題目】He often helps his parents with the housework ________ his spare time.

A. at B. on C. about D. in

【答案】D

【解析】

句意“他經(jīng)常在他的空閑時(shí)間幫父母做家務(wù)”。in one’s spare time在某人空閑時(shí)間，故選D。

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