单选题 The cyclist was ______ his bike by a truck.

【正确答案】 B
【答案解析】句意：骑自行车的人被一辆卡车从自行车上撞下来了。knock sth off sth把…从…上碰掉。hit off简洁而精确地描述。knock sb down将某人撞倒，该词组是不及物词组，后不需接任何成分。