答案是：C 动词不定式做定语.
== The question WHICH / THAT WILL BE DISCUSSED tomorrow is of great importanceSuddenly he was _____on the head and lost consciousnessA hitting B hitted ChitDhat这道题呢C 语法hit sb. on the head ----打中某人的头== be hit on the head ------头被打中thin____he is ,he can lift the heavy box.A as B althoughCwhileDsince这个呢？着急啊Thin__as / that / though __he is ==Though he is thin / Although he is thin - - - -祝你快乐。