All the students in my class can’t ______ the math problem. It’s too difficult for us.
A. work on     B. work out        C. work for
B

試題分析：句意：我們班級(jí)所有的學(xué)生都不能計(jì)算出這道數(shù)學(xué)題，它對(duì)于我們來(lái)說(shuō)太難了。A. work on從事于…… B. work out 計(jì)算出；C. work for為……而工作，根據(jù) It’s too difficult for us.可知不能計(jì)算出這道數(shù)學(xué)題。
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