【題目】I will go on with the experiment unless my mother _____ me to stop.

A. will ask B. asks C. asked D. has asked

【答案】B

【解析】試題分析：句意：除非我媽媽讓我停止不然我會繼續(xù)實驗的。Unless引導(dǎo)的是條件狀語從句，根據(jù)“主將從現(xiàn)”原則，此空應(yīng)用一般現(xiàn)在時態(tài)，所以選B。

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