-Will you be able to finish your report today?-( ).A.mustn't heB.needn't heC.isn't heD.shouldn't he求原因.应该是John must be in the chemistry lab,(

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-Will you be able to finish your report today?-( ).A.mustn't heB.needn't heC.isn't heD.shouldn't he求原因.应该是John must be in the chemistry lab,(
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-Will you be able to finish your report today?-( ).A.mustn't heB.needn't heC.isn't heD.shouldn't he求原因.应该是John must be in the chemistry lab,(
-Will you be able to finish your report today?-( ).
A.mustn't he
B.needn't he
C.isn't he
D.shouldn't he
求原因.
应该是John must be in the chemistry lab,(

-Will you be able to finish your report today?-( ).A.mustn't heB.needn't heC.isn't heD.shouldn't he求原因.应该是John must be in the chemistry lab,(
must在这里做情态动词,表推测,后面反义疑问句只跟推测的内容有关
如果推测的内容是肯定的,就用否定;反之,用肯定
如果LZ还有疑问的话,就尽管密我吧.