Jim came into the room Millie sat down on the chair last night.A. asB. whileC. whenD. sin

问题补充：

Jim came into the room Millie sat down on the chair last night.

A. as

B. while

C. when

D. since

答案：

(答案→)A. as

B. while

C. when

D. since

解析：

试题分析: 句意：昨晚靡丽坐在椅子上时，吉姆进了房间。as当……时，

从句瞬间性动词，主从句同时发生； while当……的时候，从句为进行时，

延续性动词；when当……的时候，从句可与主句先后或同时发生，从句可

为瞬间和延续性动词，时或先后发生；since自从。came into与sat down为

瞬间动词，同时发生，故选A