.Not only her mother but slao her father_____in the same school for twenty years.

A．will teach

B．has taught

C．have taught

D．are teaching

违法犯罪分子往往是凶恶、狡猾的。青少年在与其斗争时    [ ]

A．要敢于挺身而出，不能视而不见    

B．要讲究策略、技巧，以智取胜    

C．尽量减少不必要的伤亡，不能蛮干

D．尽量巧妙地借助社会力量将不法分子抓获