—Tom came to work last Friday but no one has seen him since. —he have had an accident ?A.

问题补充：

—Tom came to work last Friday ,but no one has seen him since.

—he have had an accident ?

A. Should

B. Must

C. Might

D. Could

答案：

A. Should

B. Must

C. Might

(答案→)D. Could

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