Question

【题目】Amy was reading a book __________I came in.
A.when
B.while
C.because
D.though

Answer 1

【答案】A
【解析】本题考查be doing...when，译为Amy正在读书突然我进来了。本题易错选while, while从句多用延续性动词，本题中come为瞬间动词，故选A。