It worried her a bit...____ her hair was turning gray.A.while B.if C.thatD.for

问题描述:

It worried her a bit...
____ her hair was turning gray.
A.while
B.if
C.that
D.for

C.强调

C
非常明显。别的就不重复罗唆了~

C
头发白了使她很焦虑

C. that

C.that
后面是个完整的句子
D就错了,而B.if也没这种用法
A的话放while也没这种用法.

如此简单的从句结构和通用方式还来这边问?
楼上正解