--- Jack came to work last Saturday, but no one has seen him since.--- he have g
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--- Jack came to work last Saturday, but no one has seen him since.
--- ________ he have gone abroad?
A.Need
B.Must
C.Should
D.Could
试题答案
D
表推测的否定句和疑问句中，情态动词应用can或could。must表推测时，只用于肯定句。