问题
选择题
Hard as a teacher may try, he can't ____ to make all his students make a difference in study, letting alone in life. [ ]
A. ensure
B. be sure
C. guarantee
D. insure
答案
答案：C
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Hard as a teacher may try, he can't ____ to make all his students make a difference in study, letting alone in life. [ ]
A. ensure
B. be sure
C. guarantee
D. insure
答案：C