It worried her a bit ________ her hair was turning grey．

It worried her a bit ________ her hair was turning grey．

A.while

B.that

C.if

D.whether

答案及解析： B

解析：

解析：句意：她的头发渐渐变得花白，使她不安。该题常错选C、D。用if和whether引导该句则句意不通。主语从句较长时，多放在句子后部，用it作形式主语，此时，that也不能省略。