The foreigners had just left the museum______they heard a bomb explode at the exit.

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问题 The foreigners had just left the museum______they heard a bomb explode at the exit.

选项 A、before
B、since
C、as soon as
D、when

答案D

解析 考查固定句型。had(just/hardly/scarcely)done sth.when…意为“刚做完某事,这时……”。
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