题目内容：

They need ___ their homework first.A,to do B.doing C.finish D.finishes

优质解答

选Aneed一般有两种用法,一种是作为实意动词,还有一种是用于虚拟语气.这里need作实意动词.实意动词用法有1）sb need to do sth 某人需要做某事 2）sb need sth 某人需要某物.注意,这里sth是指实物.而need doing一般用...