Hard as a teacher may try, he can’t ______to make all his stu
dents make a difference in study, letting alone in life.
| A．make sure | B．be sure | C．guarantee | D．insure |
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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．make sure | B．be sure | C．guarantee | D．insure |
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