题目内容
Fill in the blanks with the verbs in their proper forms(用所给动词的适当形式填空,词数不限):
At this time last year, the underground railway ______ (build).
答案:was being built
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题目内容
Fill in the blanks with the verbs in their proper forms(用所给动词的适当形式填空,词数不限):
At this time last year, the underground railway ______ (build).