Our teachers are very friendly to us.  We _____  friends since three years ago.
A. have been       B. have become     C. would be
A

試題分析：句意：我們的老師對我們非常友好，我們?nèi)昵熬统蔀楹门笥蚜�。根�?jù)句中時間狀語since three years ago（自從三年前，表時間段）可知此空應(yīng)用現(xiàn)在完成時態(tài)，和時間段連用要用延續(xù)動作動詞，故選A。
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