I was about to leave my office _____i was told that the pres

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I was about to leave my office _____i was told that the president would visit our company.
A.while B when C as D if
为什么不能选C

这里只能用when.
be about to do ...when 意思是”正要去做某事这时……”
下面讲讲为什么不能选C
因为when可以和延续性动词连用,也可以和短暂性动词连用；
而as只能和延续性动词连用.
本题中"leave"和"told"都不是连续性动词,
所以不能用------as-------

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