2. 外语
  3. Jack______on the project day and night for two months now, and I am beginning to worry about his health.

Jack______on the project day and night for two months now, and I am beginning to worry about his health.

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问题 Jack______on the project day and night for two months now, and I am beginning to worry about his health.
选项 A、has been working
B、would be working
C、had been working
D、was working
答案A
解析 动词时态题。题意：“两个月来杰克一直夜以继日地做这个项目，我开始担心他的身体了。”这里应使用现在完成进行体表示工作还将继续下去。
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