问题
选择题
—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
答案
答案：B
考查短语：have difficulty（in ）doing sth 做什么事情有困难.句意：你的旅行怎么样呀？你几乎不能想象出我们在探索大草原时有多么的困难。
