宾语从句的选择题

问题描述:

宾语从句的选择题
The teacher asked him.
A.if the classroom had beencleaned
B.when was Albert Einstein born
C.how would the scientists find out the result
D.where could he find the library
选A.先翻译一下,为什么选A,而不选别的?

宾语从句后面是陈述句的语序,就是说不用把助动词提前