2. 外语
  3. -- I bought this computer for $500 last week.-- It’s on sale this week for only $4,00. You should have waited.-- Oh, Really? But

-- I bought this computer for $500 last week.-- It’s on sale this week for only $4,00. You should have waited.-- Oh, Really? But

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问题 -- I bought this computer for $500 last week.-- It’s on sale this week for only $4,00. 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，表示当时我怎么会知道呢。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。但是选择项中没有提供，那就只能选择最接近的时态了。
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