问题
选择题
_____ to ring and let us know you' ve got back safely. [ ]
A. Be sure
B. Make sure
C. Insure
D. Assure
答案
答案：A
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_____ to ring and let us know you' ve got back safely. [ ]
A. Be sure
B. Make sure
C. Insure
D. Assure
答案：A