单选题
She was late yesterday because the rear tire was ______ by a nail and went flat as she was on the way here.
【正确答案】
A
【答案解析】题意是：她昨天迟到了，因为她来这儿的路上车后胎被一颗钉子______扁了。[A]pierced“刺穿，刺破”，符合题意。[B]punched“打洞，打孔”，[C]thrust“(用刀、箭等)刺，扎”，[D]penetrated“穿过，透入”都不符合题意。