—How about your travel? 
—You can hardly imagine what difficulty we have had ___________ the vast desert.
A．exploringB．exploredC．to exploreD．explore
A

試題分析：考查詞組：句意：--你的旅行怎樣？--你很難想象我們探索廣闊的沙漠是多么的不易。
實際上we have had ___________ the vast desert.是修飾the difficulty的定語從句，詞組 Have difficulty (in) doing sth，在...方面有困難，in可以省略，故選A.
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