He put on a smile and said it didn’t matter in fact he cared too much about what she sai

问题补充：

He put on a smile and said it didn’t matter，，in fact，he cared too much about what she said.

A. When

B. As

C. While

D. Once

答案：

A. When

B. As

(答案→)C. While

D. Once

解析：考查连词辨析。A当…时；B随着；C当…时；然而；尽管；D一旦；句意：他现在满脸都是微笑说这没关系。然而，实际上他对于她说的话很在意。故C正确。