问题补充:
Only when she reached her office she had left her key at home.
A. she realizes
B. does she realize
C. she realized
D. did she realize
答案:
A. she realizes
B. does she realize
C. she realized
(答案→)D. did she realize
解析:考查only的倒装句。当only放在句首,且强调的是状语的时候,后面的主句使用部分倒装的形式。本题only放在了句首,后面强调的是时间状语when she reached her office,故后面的主句使用部分倒装的形式。故句中的reached,说明本句使用的是一般过去时,故D项正确。