问题
选择题
—Doing eye exercises works well in _______ our eyesight. —So it does. [ ]
A. to protect
B. protected
C. protects
D. protecting
答案
答案：D
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—Doing eye exercises works well in _______ our eyesight. —So it does. [ ]
A. to protect
B. protected
C. protects
D. protecting
答案：D