If you have really been studying English for so long, it’s about time you__________able to write letters in English.

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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.

选项 A、should be
B、were
C、must be
D、are

答案B

解析 习惯用法。it is (high) time sb.did sth.为固定用法,从句中动词用一般过去时。
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