【題目】Her grandparents ________ in Shanghai for about twenty years.
A.live
B.have lived
C.are living
D.lived

【答案】B
【解析】句意：她的祖父母在上海生活了大約二十年。for about twenty years大約二十年，介詞for+一段時間，用于現(xiàn)在完成時�，F(xiàn)在完成時的結構是：have/has+過去分詞。根據(jù)句意，故選B。

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