问题
选择题
Only after one has become a parent _____ how great his parents are．
A．he will realize
B．will he realize
C．that he realizes
D．he does realize
答案
答案：B
题目分析：句意：只有一个为人父母了，他才知道父母多么的伟大。Only+副词/介词短语/状语从句，并放在句首的时候，后面的主句用部分倒装，助动词/be动词/情态动词放在主语前面，所以选B。