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He _______the 8:20 bus because he didn’t leave home till 8:25.A、couldn’t have ca
He _______the 8:20 bus because he didn’t leave home till 8:25.A、couldn’t have ca
游客
2024-09-12
21
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问题
He _______the 8:20 bus because he didn’t leave home till 8:25.
选项
A、couldn’t have caught
B、ought to have caught
C、shouldn’t have caught
D、must not have caught
答案
A
解析
because引导的分句用了过去时,因此本句是对过去的推测。而根据他出门的时间,可知他肯定没有赶上车,要用couldn’t表否定推测,答案为A项couldn’t have caught。must表推测时只用于肯定句中,ought to have done表示“本应该”,shoudn’t have done表示“本不应该”。
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