—What’s his monthly ine?
—Well, he earn as as 4,000 dollars a month when his business runs well.
A. can; much
B. might; many
C. must; far
D. should; high
网友回答
(答案→)A. can; much
B. might; many
C. must; far
D. should; high
解析：考查情态动词和词义辨析。“他的月收入是多少？”“噢，当他的生意做得好的时候，他一个月能赚4000美元。”can“能够，可以”；might没有can的可能性大；must“必须”；should“应该”。much“多”，修饰不可数名词，as much as“多达”。故选A。