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The meeting was to _at 9 o'clock but the manager_until twent

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The meeting was to _at 9 o'clock but the manager_until twenty minutes later.
A start ;didn't turn
B have started ;didn't turn up
C start ;hadn't turned up
D be started ;hadn't turned up
选哪个?为什么
结构是:原本 -- - - -- ,但是-- - -.
原本 加 完成式-- ,but 加 一般过去时 又如
I was to have met him at the station,but I suudenly fell ill.