Question

Susan was reading a newspaper on the train_________ a strange old man come over.

A．when

B．while

C．before

D．after

Answer 1

A               

             
試題分析：考查連詞辨析。When 當。。時候；while 然而；before在。之前；after在。。之后。句意 蘇珊正在火車上讀報紙，這時一個陌生來走過來。考查固定搭配， be doing sth when 從句。正在做某事這時發生了某事。所以選 A 項。