【題目】-Betty was doing her homework______the door bell rang.

A.when B.if C.because D.and

【答案】A

【解析】

試題分析：句意：--當(dāng)門鈴響的時候，Betty正在做他的作業(yè)。A.when當(dāng)……的時候了；B.if 如果；C.because因?yàn)椋籇.and和，又。根據(jù)題意，故選A。

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