There's some doubt_____she will be able to repay the money o

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There's some doubt_____she will be able to repay the money on time.
A.that B.if C.what D.whether
选什么?为什么?（什么从句,充当什么成分,其他选项为什么不行）
这有个比较的句子，无比对比解析下。
i don't doubt __ he will come.
if
为什么？

选A,that作连词连接前后两个完整的句子,构成宾语从句.意思是：有人怀疑她是否能够按期重新付钱.
B/C用在此题中意思和作用是一样的,如果选这两个,句子末尾则要加一个or not,表示怀疑的两种结果.
c:what是连接主语从句的,不适用于此地.

空里填什么并解释 There’s some doubt_____ she will be able to repay t With the money you m____,you will be able to help others 用perhaps there will be/perhaps people will able to .in the f some kids with autism will grow up to be able to live on the there (be) your help,I will perhaps be able to complete the Do you think man will be able to live on the moon some day? We will be able to see some of the important treasures comin There will be some paper money in the future 改为否定句 With this faith we will be able to hew out of the mountain o We will be able to get there tomorrow if we catch the early there will be some paper money in 100 years It's ___ they will be able to attend the meeting.