Although we had told them not to keep us waiting they made no to speed up deliveries.A.

问题补充：

Although we had told them not to keep us waiting, they made no to speed up deliveries.

A. trial

B. attempt

C. action

D. progress

答案：

A. trial

(答案→)B. attempt

C. action

D. progress

解析： 四个选项分别表示试验、试图尝试、行动和进步，根据题意选B，尽管我们已经告诉他们，不要让我们等待，他们仍不想加快交货。

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