You don’t know about the difficulty I had ______ the work then at all.

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问题 You don’t know about the difficulty I had ______ the work then at all.

选项 A、done
B、to do
C、for doing
D、in doing

答案D

解析 此题考查的是固定用法have difficulty (in) doing sth.,属于对动名词用法的考查。
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