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  3. We had already sent out the invitation cards, but we didn’t know how many people_________.

We had already sent out the invitation cards, but we didn’t know how many people_________.

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问题 We had already sent out the invitation cards, but we didn’t know how many people_________.
选项 A、come
B、came
C、will come
D、would come
答案D
解析 根据didn’t know可知，这里表示过去发生的事情，应用表示过去的时态，故可排除选项A、C。另外，根据句意可知，这里应用过去将来时，表示在过去看来将要发生的事情，即谓语动词用“would +动词原形”的形式。故选D。
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