问题
选择题
-- I didn't realize how popular the restaurant was until I made a reservation the other day.
-- I beg your pardon, but when __________?
A．was you realized it
B．it was that you realized it
C．you realized it
D．was it that you realized it
答案
答案：D
题目分析：本句考查强调句，正常的语序是：it was when that you realized it，因为是问句，所以把when提到前面去了。句意：——直到那天我定了饭，我才知道这家饭店是多么的出名了。——你再说一遍，你究竟是什么时候知道的。