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【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:—我現在可以上網嗎?—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……時候。根據句意及題干分析此題應選B。

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