In time of serious accidents. we know some basic things about first aid,we can save lives. A.wheth——青夏教育精英家教网—

摘要：In time of serious accidents. we know some basic things about first aid,we can save lives. A.whether B.until C.if D.unless

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In time of serious accidents，______ we know some basic things about first aid, we can save lives.

　　A. whether B. until　　 C. if D. unless

In time of serious accidents，_____ we know some basic things about first aid,we can save lives.

A.whether B.until　　 C.if D.unless

In time of serious accidents， ________ we know some basic things about first aid, we can save lives.

A．whether

B．until

C．if

D．unless

In time of serious accidents，____we know some basic things about first aid，we can save lives.

A whether B. until C. if D unless

In time of serious accidents，____we know some basic things about first aid，we can save lives.

A whether B. until C. if D unless

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