---JackcametoworklastSaturday,butnoonehasseenhimsince.---________he

发布时间：2020-08-06 18:28:09

--- Jack came to work last Saturday, but no one has seen him since.--- ________ he have gone abroad?A.NeedB.MustC.ShouldD.Could

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D解析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。
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