--Who is the boy over there?Is it john?--No,it_____ be him.John is much taller.A.mustn'tB.may notC.can,tD.needn't--John ______ come to see us tonight,but he isn't very sure yet.A.mayB.canC.has toD.must两问,选啥?为啥?

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--Who is the boy over there?Is it john?--No,it_____ be him.John is much taller.A.mustn'tB.may notC.can,tD.needn't--John ______ come to see us tonight,but he isn't very sure yet.A.mayB.canC.has toD.must两问,选啥?为啥?
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--Who is the boy over there?Is it john?--No,it_____ be him.John is much taller.A.mustn'tB.may notC.can,tD.needn't--John ______ come to see us tonight,but he isn't very sure yet.A.mayB.canC.has toD.must两问,选啥?为啥?
--Who is the boy over there?Is it john?
--No,it_____ be him.John is much taller.
A.mustn't
B.may not
C.can,t
D.needn't
--John ______ come to see us tonight,but he isn't very sure yet.
A.may
B.can
C.has to
D.must
两问,选啥?为啥?

--Who is the boy over there?Is it john?--No,it_____ be him.John is much taller.A.mustn'tB.may notC.can,tD.needn't--John ______ come to see us tonight,but he isn't very sure yet.A.mayB.canC.has toD.must两问,选啥?为啥?
C,can't be 表推测
A,may表不确定,后面有not sure嘛

1、C
表示否定但是很确定的猜测用can't
2、A
表示肯定但是不是很确定的猜测用may/might

C和A
第一题.mustn't是不允许的意思may not是可能不是的意思needn't是不需要的意思。一般CAN能用于否定
第二题may是可能的意思

(1)c 表否定的推测用CAN'T
(2)A MAY表可能

C,A

C。mustn't一般不能这样用的,can't,不可能 从下文就可知这里是不可能。
A。may 表推测
加油哦。。。