His son had entered the university _____he came back to China.A a_英语解答

His son had entered the university _____he came back to China.
A after
B if
C because
D before
选哪一个

人气：231 ℃　时间：2020-05-13 15:31:04

解答

D,前面是过去完成时,后面是一般过去时,说明前句的事发生在后句事件之前,所以用before,表示他回中国前他儿子就进大学了