【題目】–May I surf the Internet now?-No, _____ you have finished washing the dishes.

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

【答案】B

【解析】

試題分析：句意：—我現(xiàn)在可以上網(wǎng)嗎？—不，除非你洗完這些盤子。A. if 如果；B. unless除非；C. because因?yàn)椋?/span>D. when當(dāng)……時(shí)候。根據(jù)句意及題干分析此題應(yīng)選B。

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