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— Look at the boy playing basketball on the ground. Is it George?
— It ________ be him. He told me he would play basketball after class, but he’s not sure.
A.mustn’t B.mustC.can’tD.may
D
mustn’t 禁止,一定不;must必须,一定; can’t不能,可能不;may可以。句意:看这个在操场上打篮球的男生,是乔治吗?——不可能是他。他告诉我他会在课后打篮球,但是他不确定。情态动词之间的最大区别就是表达语气的不同,结合语境可知选D。
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