—How about your travel?—You can hardly imagine what difficulty we have had _____

题干

—How about your travel?
—You can hardly imagine what difficulty we have had ___________ the vast desert.

A．exploring

B．explored

C．to explore

D．explore

上一题下一题 0.64难度单项选择更新时间:2014-06-12 06:05:50

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