Question

August always comes ________ we remember nothing but clear skies, green fields, and sweet-smelling flowers.

A. whenB. beforeC. untilD. if

Answer

A

【解析】

试题分析：考查状语从句。句意：八月来的时候我们只记得明亮的天空，碧绿的的田野还有芳香四溢的花朵。句中when引导时间状语从句，表示“当……时候”，故选A。

【学法指导】

while，when，as的用法区别

都译为“当…的时候”,区别为：when后的从句谓语动词既可是延续性动词，也可是短暂性动词，而且还可作并列连词，译为“这时”。但以下句型一定用when，作并列连词：

句型A：be about to do…when…正要做…这时(发生另一事)

句型B：was/were doing…when…正在…这时(发生另一事)

句型C：had done…when…刚要做…这时(发生另一事)

1.We were about to set out when it began to rain.我们刚要出发天突然下雨了。

2.He had hardly sat down when his mobile rang.他刚一坐下手机就响了。

3.I was walking along the bank of the river when I fell into it.我正沿河岸散步突然掉进水里。

while后的从句谓语动词只能是延续性动词,强调主从句的两个动词同时发生；while也可作并列连词,表示两个动作的对比,译为“而”“然而”.as则表示两个变化中的动作的同时性,译为“一边…一边…”。

1.While his mother was cooking in the kitchen,the boy fell asleep in the chair.(在一个延续动作过程中发生另一个动作)

2.He hurried home,looking behind as he went.他匆匆回家，边走边往后看。

考点：考查状语从句