The thief was caught ______ he was leaving the shop.

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问题 The thief was caught ______ he was leaving the shop.

选项 A、after
B、as
C、before

答案B

解析 [A][C]都表示主从句的动作发生有先后，从句谓语一般用过去时态；[B]强调主从句动作同时进行，从句谓语一般用进行时态。因此本题选[B]。

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