difficulty是什么词性 按适当形式填空:He has_ (difficult) doingdifficulty是什么词性按适当形式填空:He has_ (difficult) doing his homework.

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difficulty是什么词性 按适当形式填空:He has_ (difficult) doingdifficulty是什么词性按适当形式填空:He has_ (difficult) doing his homework.

difficulty是什么词性 按适当形式填空:He has_ (difficult) doingdifficulty是什么词性按适当形式填空:He has_ (difficult) doing his homework.
difficulty是什么词性 按适当形式填空:He has_ (difficult) doing
difficulty是什么词性
按适当形式填空:He has_ (difficult) doing his homework.

difficulty是什么词性 按适当形式填空:He has_ (difficult) doingdifficulty是什么词性按适当形式填空:He has_ (difficult) doing his homework.
difficulty