________ we ________ much longer, we might not even have had the spot on the ro
题型：不详难度：来源：
________ we ________ much longer, we might not even have had the spot on the rooftop.| A．Should; hesitate | B．Was; hesitating | C．Did; hesitate | D．Had; hesitated |
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答案
| D |
解析
| 考查虚拟语气。当表示与过去的事实相反时，主句用would/might/should+have done；而从句用had done。根据might not even have had可知，是对过去的虚拟，从句用过去完成时。本句省略了if，把had提到了句首，完整形式应该是if we had hesitated...。故选D。 |
举一反三
If we ___________some measures, we might have prevented the environmental pollution.| A．take | B．had taken | C．took | D．have taken |
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— ________ he ________ anything about this historic site?
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