【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】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因為;D. when當(dāng)……時候。根據(jù)句意及題干分析此題應(yīng)選B。

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