I think Tom, as the head of a big department, should either study regularly or ____his job.
A．quitsB．to quitC．quittingD．quit
D
考察固定用法.either…or…要么…要么…,這是一個(gè)表示選擇關(guān)系的短語(yǔ)。本題是放在情態(tài)動(dòng)詞后面，所以都使用動(dòng)詞原形。故D正確。
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