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個時間,只能用while.【鞏固練習(xí)】1)I had just stepped out of the bathroom and was busily drying myself with a towel ____ I heard the steps.A. while B. when C. since D. after2)He was about halfway through his meal ____ a familiar voice came to his ears.A. why B. where C. when D. while3)We were swimming in the lake ____ suddenly the storm started.A. when B. while C. until D. before4)— I’m going to the post office.— ____ you’re there, can you get me some stamps?A. As B. While C. Because D. If5)I ____ along the street looking for a place to park when the accident ____.A. went。 was occurring B. went。 occurredC. was going。 occurred D. was going。 had occurred答案BCABC二、Before/afterbefore引導(dǎo)時間狀語從句時表示主句的動作發(fā)生在從句動作之前,常翻譯為在“……之前”,“……才……”或“……就……”。. See me before you leave.. Before they drive any of the buses, they will have to pass a special test.after引導(dǎo)時間狀語從句時表示主句的動作發(fā)生在從句動作之后. I saw them after I arrived.. I found his pen after he has left.【鞏固練習(xí)】He was told that it would be at least three more months ____ he could recover and return to work.A. when B. before C. since D. that