The armor, infantry and Aother military forces Bwere held up by Cthe enemy counter attack, thus Dcaused the delay in the advance

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问题 The armor, infantry and Aother military forces Bwere held up by Cthe enemy counter attack, thus Dcaused the delay in the advance.

选项 A、 
B、 
C、 
D、 

答案D

解析 D应改为causing。D项应为现在分词形式,作状语表示结果。
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