题目内容

— You’d better keep quiet in class.
— Sometimes I______ . Yesterday, I was as quiet as a mouse during my English class.
A．wouldB．doC．didD．was
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。
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