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We _____ close friends since we got to know each other in 2006, and we always keep in touch.
A．wereB．have beenC．will beD．had been
B
考查時(shí)態(tài)。Since自從，其主句一般用現(xiàn)在完成時(shí)。
句意：自從我們2006年認(rèn)識(shí)至今，我們?nèi)匀皇呛苡H密的朋友，并且一直保持聯(lián)系。
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