问题
选择题
It's good for you to keep ________ when you have difficulty _________. [ ]
A. trying; to do it
B. doing; to do it
C. to try; to do
D. trying; doing it
答案
答案：D
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It's good for you to keep ________ when you have difficulty _________. [ ]
A. trying; to do it
B. doing; to do it
C. to try; to do
D. trying; doing it
答案：D