题干
.
. ---All the building materials have been washed away.
---So I have heard. But there was no sign ______ a heavy rain was on the way last night.
. ---All the building materials have been washed away.
---So I have heard. But there was no sign ______ a heavy rain was on the way last night.
A：whe
B：If
C：which
D：that
答案(点此获取答案解析）
D
