应该去e加ing,be used to doing 表示“习惯于”,后留跟名词或动名词,be也可用get等代替.be used to 如后跟动词原形,表式"被用于",用于被动语态度中.at certain times作为定语已经说明了应该是一个习惯或者约定俗成的.
一道SAT语法题求助!The image of Uncle Sam, in his red and white stri
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