They didn't realize how serious the problem was.()

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问题 They didn't realize how serious the problem was.()

选项 A.know
B.forget
C.doubt
D.remember

答案A

解析本题是对动词的考查。题干:他们没有意识到这个问题有多严重。题干划线词realize 意为“意识到,实现”。四个选项:know意为“知道”,forget意为“忘记”,doubt 意为“怀疑”,remember意为“记住”,因此正确答案为A。
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