2. 外语
  3. I (keep) ______ up correspondence with him since he went abroad.

I (keep) ______ up correspondence with him since he went abroad.

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问题 I (keep) ______ up correspondence with him since he went abroad.
选项
答案have kept
解析 自从他出国，我们一直保持着通信联系。此句考查动词的时态。
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