60 Peter did very well in today’s math test. He ___ very hard last night.
(A) should study
(B) should have studied
(C)must study
(D)must have studied

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最佳解!
	從哪跌倒從哪站起國一上 (2016/06/07) should have + p.p. 表示當時應該做（但沒有做）must表「推測時」。作「一.....觀看完整全文，請先登入檢舉

Curtis 大四下 (2016/05/12)
對過去肯定的假設 must have + P.P

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