When we got there, what were left behind __ empty bottles.

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问题 When we got there, what were left behind __ empty bottles.

选项 A、had been
B、are
C、were
D、was

答案C

解析 根据题干可知,此空的时态应该是过去时,从而排除B 。再由what引导的主语从句中的谓语动词were,根据主谓一致原则,可以排除D 。然后根据题意,本题陈述的是一个事实,故答案为C 。
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