问题
选择题
| _____ is important and necessary for us _____ English well. |
A. This; learn B. It; learn C. That; learning D. It; to learn |
答案
答案：D
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| _____ is important and necessary for us _____ English well. |
A. This; learn B. It; learn C. That; learning D. It; to learn |
答案：D