He bought another new car. He a lot of money.A. must earnB. must have earnedC. can earnD.

问题补充：

He bought another new car. He a lot of money.

A. must earn

B. must have earned

C. can earn

D. could have earned

答案：

A. must earn

(答案→)B. must have earned

C. can earn

D. could have earned

解析：考查情态动词表示推测。对现在的情况进行推测，使用“情态动词+动词原形”；对过去的情况进行推测，使用“情态动词+have done”;根据本题的bought说明是对过去的情况进行推测，排除AC项。D项could have done本可以做某事，实际上却未做，该短语表示的是虚拟语气。Must have done一定做了某事；是对过去所发生事情的肯定推测。句意：他买了一辆新车，他一定挣了很多钱。故B正确。