— 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
此題考查謂語(yǔ)替代詞do 的用法。此處do指代keep quiet in class，根據(jù)前面的sometimes 可知，指的是經(jīng)常性的行為，用do而不用did。
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