四六级考试

【单选题】 They _____ so tired if they _____ for a whole day.
A．wouldn't feel, didn't walk
B．wouldn't feel, weren't walking
C．wouldn't be feeling, weren't walking
D．wouldn't be feeling, hadn't been walking

网考网参考答案：D
网考网解析：
此句考查虚拟语气时态混合的用法，下句是与现在事实相反，从句是与过去事实相反。正确答案是D。 查看试题解析出处>>