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Colin was about to get off the camel ________ a child ran towards him.
A.whileB.whenC.asD.since
B

试题分析:考查固定结构:be about to do when…刚要做…这时…,句意:Colin刚要下骆驼这时一个男孩朝他跑过来。选B。
点评:和when常常搭配的固定用法还有:过去完成时(had done)…when…,过去进行时(was/were doing +when…)。
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