________ we ________ much longer, we might not even have had the spot on the rooftopA.Should; hesitateB.Was; hesitatingC.Did; hesitateD.Had; hesitated
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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。