If you have really been studying English for so long, it’s about time you ______ able to write letters in English.[1999]

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问题 If you have really been studying English for so long, it’s about time you ______ able to write letters in English.[1999]

选项 A、should be
B、were
C、must be
D、are

答案B

解析 本句使用了It is about time...句型,在这个句型中,从句里谓语动词要用过去式表示虚拟。因此,本句的正确答案应该是were。
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