问题
选择题
— You’d better keep quiet in class.
— Sometimes I______ . Yesterday, I was as quiet as a mouse during my English class.
A．would
B．do
C．did
D．was
答案
答案：B
此题考查谓语替代词do 的用法。此处do指代keep quiet in class，根据前面的sometimes 可知，指的是经常性的行为，用do而不用did。