Question

If their oxygen     , the two British men     a chance of surviving.

A．ran out, had	B．didn’t run out, would have
C．had run out, didn’t have	D．hadn’t run out, would have had

Answer 1

D

考查時(shí)態(tài)。句意：如果他們的氧氣已經(jīng)耗盡，這兩個(gè)英國(guó)人應(yīng)該有一個(gè)幸存的機(jī)會(huì)。結(jié)合語(yǔ)境可知從句描述的是過(guò)去已經(jīng)完成的動(dòng)作，故用過(guò)去完成時(shí)態(tài)。表示對(duì)過(guò)去本來(lái)能夠做某事而沒(méi)有做事情的假設(shè)，用“could+have+done”，故選D。