The armor, infantry and (other military forces) (were held up) by (the enemy counter attack), thus (caused) the delay in the adv

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问题 The armor, infantry and (other military forces) (were held up) by (the enemy counter attack), thus (caused) the delay in the advance.

选项 A、other military forces
B、were held up
C、the enemy counter attack
D、caused

答案D应改为causing。

解析 D项应为现在分词形式,作状语表示结果。
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