问题
选择题
---- My baby has a heart trouble. ---- Did the doctor find it difficult ______ ?
A．in treating
B．treating
C．for treating
D．to treat
答案
答案：D
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---- My baby has a heart trouble. ---- Did the doctor find it difficult ______ ?
A．in treating
B．treating
C．for treating
D．to treat
答案：D