Sam ______ coins since he was eleven years old, and now he has hundreds of them.
A．collectedB．had collected
C．has been collectingD．had been collecting
C
考查時(shí)態(tài)。句意“薩姆自從11歲就開(kāi)始收集硬幣了，現(xiàn)在他有幾百個(gè)了。”表示動(dòng)作發(fā)生在過(guò)去，一直持續(xù)到現(xiàn)在，有可能繼續(xù)持續(xù)下去。用現(xiàn)在完成進(jìn)行時(shí)。故選C。
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