题目内容
He ______ English for six years by the time he takes his examination.
| A.was studying | B.would have been studying |
| C.had been studying | D.will have been studying |
D
解析
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题目内容
He ______ English for six years by the time he takes his examination.
| A.was studying | B.would have been studying |
| C.had been studying | D.will have been studying |
D
解析