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此题应填unless还是until

2016-10-04来源:和谐英语

此题应填unless还是until

请看下面这道题:

I didn’t manage to do it __________ you had explained how.

A. unless                        B. until                        C. when                        D. since

此题应选B。这道题从句意来看似乎选A,B都行。不少考生看不出选项A错在什么地方,这里我们可以从句意和时态两方面来分析:

选A,句意为:你若没给我解释,我就不会做好它。—-按此选择,主句谓语应用would have managed之类的,也就是说这是一个虚拟语气的句子。

选B,句意为:直到你给我作了解释,我才会做。—-按此选择,你先给我解释,我后才会做,所以“解释”用过去完成时,“会做”用一般过去,顺理成章。

请做以下试题:

1. I didn’t know anything about it___ he told me.

A. unless                       B. until                          C. when                         D. since

2. _________ he spoke I hadn’t realized he was a foreigner.

A. Unless                       B. Until                         C. When                         D. Since

3. I didn’t realize he was our teacher _________ he came in front of me.

A. unless                       B. until                          C. when                          D. since

4. _________ he told me,I had no idea of it.

A. unless                       B. until                          C. when                          D. since

答案:1. B 2. B 3. B 4. B