—I’m afraid that I can’t do it.—Oh you should believe in yourself. You won’t know what yo

问题补充：

—I’m afraid that I can’t do it.

—Oh, you should believe in yourself. You won’t know what you can do you try it.

A. if

B. because

C. until

D. while

答案：

A. if

B. because

(答案→)C. until

D. while

解析：考查连词. if 是否,如果;because因为;until直到;while然而,当……时；句意：我担心我做不到。——哦，你应该相信自己。直到你尝试过后，你才能直到自己能做什么。固定结构not…until直到...才，故选C。