They must have been enjoying themselves there,otherwise they _________ so long.?

A.can’t have stayed              B.wouldn’t have stayed?

C.needn’t have stayed    D.couldn’t stay?

B?


解析:

must have done表示對(duì)過(guò)去有把握的推測(cè),他們一定在過(guò)去那時(shí)玩得很高興。后面是否則他們就不會(huì)待這么長(zhǎng)時(shí)間,這里也是對(duì)過(guò)去的可能性的推測(cè)。

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