第36题: [单项选择]—My baby has a heart trouble. —Did the doctor find it difficult______. A. in treating B. treating C. for treating D. to treat 参考答案:D 答案解析:[解题指要] 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