At the moment the machine ______ at full speed.

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问题 At the moment the machine ______ at full speed.

选项 A、ran
B、was running
C、had been running
D、had run

答案B

解析 本句意为:此时此刻,机器正在全速运转。 at the moment意为“此刻”,可以推知后面的句子应该选用进行时态。
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