21. Mike’s English is so poor that I have difficulty ______ him.
(A)to understand
(B) understood
(C) understand
(D) understanding

答案：登入後查看
統計： A(60), B(18), C(19), D(78), E(0) #934972

詳解 (共 2 筆)

#3328429
固定用法  have difficult...
(共 44 字，隱藏中）
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#1160330
不懂??  選項A不行嗎??
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