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选词填空高手来解答一下!Isjackondutytoday?It()behim.It"shisturntomorrow.Amustn"tBwon"tCcan"tDneddn“t请说明原因

题目详情
选词填空高手来解答一下!
Is jack on duty today?
It ( ) be him .It"s his turn tomorrow.
A mustn"t
B won"t
C can"t
Dneddn“t
请说明原因
▼优质解答
答案和解析
选 C.can't
can't be 表示对现在情况的否定推测.
句子表明,明天才轮到他.所以,肯定不是他值日.故用 can't
肯定的推测是 must be