They _____ friends since they met in Shanghai.
A．have madeB．have becomeC．have beenD．have turned
C

此題考查時(shí)態(tài)的用法。此題句意為：自從他們在上海見面以來就成為朋友了。因?yàn)楹袝r(shí)間狀語，所以必須使用延續(xù)性動(dòng)詞be.故選C.
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