They ______ shopping, when someone knocked at the door.

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问题 They ______ shopping, when someone knocked at the door.

选项 A、are about to
B、are to go
C、were about to go
D、were to go

答案C

解析本题考查时态的用法。根据题意，应用过去时。be about to。表示即将做什么。

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