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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統計： A(161), B(441), C(595), D(2080), E(0) #1014391

詳解 (共 2 筆)

#1372187
should have + p.p. 表示當時應該做（但沒有做）

must表「推測時」。作「一定」解。
must + 原v 表示對現在的推測
must have + p.p. 表示對過去的推測
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#1339425
對過去肯定的假設 must have + P.P
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