Wash your hands＿＿＿you have dinner.A.before B.but C.when D.so
问题描述：
Wash your hands＿＿＿you have dinner.A.before B.but C.when D.so
还有几题：Early men found fire very＿＿＿millions of years ago.
A.use B.useful C.useless D.uses
Only a quarter of the Earth is＿＿＿.
A.oceans B.land C.forests D.seas
答
1.选A 在吃饭前洗手.
2选B.早期的人人们数百万年前发现火很有用.
3.选B.其他三个词都是复数.而is 后要求用单数名词.