——What's wrong?You look unhappy____Three quarters of my books ____ missing.A have B is C was D are我知道是用BE动词,可是是用is 还是was 麻烦给我说明一下为什么,
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![——What's wrong?You look unhappy____Three quarters of my books ____ missing.A have B is C was D are我知道是用BE动词,可是是用is 还是was 麻烦给我说明一下为什么,](/uploads/image/z/8365549-13-9.jpg?t=%E2%80%94%E2%80%94What%27s+wrong%3FYou+look+unhappy____Three+quarters+of+my+books+____+missing.A+have+B+is+C+was+D+are%E6%88%91%E7%9F%A5%E9%81%93%E6%98%AF%E7%94%A8BE%E5%8A%A8%E8%AF%8D%2C%E5%8F%AF%E6%98%AF%E6%98%AF%E7%94%A8is+%E8%BF%98%E6%98%AFwas+%E9%BA%BB%E7%83%A6%E7%BB%99%E6%88%91%E8%AF%B4%E6%98%8E%E4%B8%80%E4%B8%8B%E4%B8%BA%E4%BB%80%E4%B9%88%2C)
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