My sister has never played tennis before. This is the first time she to play.A. is trying

问题补充：

My sister has never played tennis before. This is the first time she to play.

A. is trying

B. was trying

C. has tried

D. had tried

答案：

A. is trying

B. was trying

(答案→)C. has tried

D. had tried

解析：考查固定句式中的时态。本题的固定句式为：It/This is/was the序数词 time that从句，句意：是某人第几次做某事的时候了。如果前面是is，后面就使用现在完成时；如果前面是was，后面就是过去完成时。本题句意：我的姐姐以前从来没有打过网球，这是她第一次打。前面使用了is，故使用现在完成时。故C正确。