【题目】If the weather had been better, we ______ a picnic yesterday.
A. must have hadB. would have
C. could have hadD. will have
在线课程【答案】C
【解析】
考查虚拟语气。句意：如果昨天的天气再好一点，我们本可以去野餐的。根据yesterday可知，本句表示与过去事实相反，主句部分要使用“情态动词+have done”表示对过去情况的虚拟，排除BD项，A项“must have done”通常表示对过去发生事情有把握的肯定推测，不符语境。故C项正确。