选D.
首先A、B选项可以直接排除（A因为不符合时态,B因为主语为第三人称单数形式）,主句中有表示过去的时间状语last night,所以选择D.楼下说得很对,本句的确是表示对过去的推测,但不是因为有时间状语,而是因为must have.也就是说,如果没有last night 就应该选C了.
He must have studied English last night,___he?
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