—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．explored

B．exploring

C．to explore

D．explore

上一题下一题 0.64难度单项选择更新时间:2011-12-28 09:26:30

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