—My baby has a heart trouble. —Did the doctor find it difficult______.

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问题 —My baby has a heart trouble. —Did the doctor find it difficult______.

选项 A、in treating
B、treating
C、for treating
D、to treat

答案D

解析 it指前一句中heart trouble。“发现做某事很困难/容易”可用find it easy/hard/ difficult to do表示。如：We find it hard to learn.因而D选项不定式to treat符合题意。

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