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例2.—Do you know him well ?
— Sure .We _________ friends since ten years ago .
Ａ. were Ｂ. have been Ｃ. have become Ｄ. have made
例3.—How long have you ____ here ?
—About two months .
Ａ. been Ｂ. gone Ｃ. come Ｄ. arrived
例4. Hurry up! The play __________ for ten minutes .
Ａ. has begun Ｂ. had begun Ｃ. has been on Ｄ. began
例5. His uncle died two years ago .（改变句子，句意不变）
His uncle has _______ _______ for two years
例6. Her mother has been a Party member for three years .（同义句）
Her mother _______ the Party three years ________ .
