"I bought this computer for $500 last week." "It’s on sale this week for only

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问题 "I bought this computer for $500 last week." "It’s on sale this week for only $400. You should have waited." "Oh, really? But how ______ I know?"

选项 A、can
B、will
C、do
D、would

答案 D

解析这里是虚拟语气，表示当时怎会知道。当然，如果用would I have known的动词时态，可能会更符合语法的规范。但是没有提供该选项。那就只能选择最接近正确的时态。

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2002November14—18,’022002ACMConferenceonComputerSupportedCooperative