It was_________your timely help that we could solve the problem.A.for B.because C.thanks to D.as a result其他为什么不能选?

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It was_________your timely help that we could solve the problem.
A.for B.because C.thanks to D.as a result
其他为什么不能选?

A for 为了 表目的
B because 后面跟句子,这里 your timely help 是名词短语,要用也得用because of.
D as a result (of)没加of.
选 C thank to 幸亏