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

解析 应改为causing。
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