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题目内容 (请给出正确答案)
Akira Nakayama ____delay the filming of his documentary in the rainforest when his equipment did not arrive on schedule.

A.has to
B.had to
C.having to
D.will have to

参考答案

参考解析
解析:四个选项是短语have to的几种时态。A选项为一般现在时,B选项为过去时,C选项为-ing形式,做非谓语成分;D选项为一般将来时。题目意为“当Akira Nakayama的设备没有按照预计时间到达时,他___推迟在热带雨林中拍摄纪录片。”when引导的时间状语从句是过去时,所以主句也应该是过去时,因此选B。
  
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