The light is still on.You -------to switch it off when you left.A.must forget B.may forget C.must have forgotten D.might forget

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Thelightisstillon.You-------toswitchitoffwhenyouleft.A.mustforgetB.mayforgetC.musthaveforgottenD.mig

The light is still on.You -------to switch it off when you left.A.must forget B.may forget C.must have forgotten D.might forget
The light is still on.You -------to switch it off when you left.
A.must forget B.may forget C.must have forgotten D.might forget

The light is still on.You -------to switch it off when you left.A.must forget B.may forget C.must have forgotten D.might forget
C
有前文“灯还亮着”,可知,这是对已存在(发生)的事作以推测的
要用must have + 过去分词 这个动词形式表示对过去的事情作以肯定推测
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