yesterday he stayed up all night____ doing his homeworkYesterday he stayed up all night____ doing his homework,so he looks sleepy today.A.longB.laterC.beforeD.late为什么选a
问题描述：
yesterday he stayed up all night____ doing his homework
Yesterday he stayed up all night____ doing his homework,so he looks sleepy today.
A.long
B.later
C.before
D.late
为什么选a
答
all night long是固定搭配，词组的意思是整夜。
答
all night long 固定搭配。昨天他一整夜忙于完成作业，所以今天看上去（很）疲倦
答
all night long
all day long
.
这些都是固定用法