摘要： Whenever you are away, you must the door A. be sure; is locking B. make sure; is locked C. be sure; will be locked D. make sure; will be locking
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Whenever you are away, you must________ the door________ .
A. be sure; is locking B. make sure; is locked
C. be sure; will be locked D. make sure; will be locking
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