----I didn't see her yesterday.----Oh,but you __________.A.must have B.ought to C.should have D.cannot have为什么选C,而不选B?说明理由.

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----I didn't see her yesterday.----Oh,but you __________.A.must have B.ought to C.should have D.cannot have为什么选C,而不选B?说明理由.
----I didn't see her yesterday.
----Oh,but you __________.
A.must have B.ought to C.should have D.cannot have
为什么选C,而不选B?说明理由.

----I didn't see her yesterday.----Oh,but you __________.A.must have B.ought to C.should have D.cannot have为什么选C,而不选B?说明理由.
你看,I didn't see her yesterday.,我昨天没看到她,这已是既成的事实了,但是从选项上看呢,全部是应该.的意思,所以是should have done ,是虚拟语气.而为什么不选B呢,是因为ought to ,你有义务,你应当去做的事,显然,你应该看到她了呀,是推测,而不是义务,所以选C,如不明白,可以再来问我~