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
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— 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：B