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一道sat语法题~if you have done the necessary research, you will f

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一道sat语法题~
if you have done the necessary research, you will feel confident (as to your statements if challenged).
A.原句
B.if someone challenges your statements
C.if there are challenges with your statements

正确答案是b,我想知道a和c错哪了,谢谢~
一道sat语法题~if you have done the necessary research, you will f
B如果你做了必要研究,当有人挑战你的观点时,你就会有自信.
A feel confident as to sth,if challenged 中,if challenged因为是省略,所以指代不清,不知道是you 还是statements被challenge了;as to至于,放在这里太拗口真的很awkward,有about/on这样更清楚便捷的表达就该选用.
C如果你的statements are with challenges就很模糊,语法没错误,但是介词with的意思给人一种附属的赶脚.而challenges 是从外部来的,不能用with.