The problem is very difficult, so many students can’t ____.

A. work them out B. work it out C. work out them D. work out it

B 【解析】 句意“這個(gè)問(wèn)題太難了，許多學(xué)生不能解出它”。根據(jù)the problem可知，用單數(shù)it，排除A和C；且在“動(dòng)詞+副詞”構(gòu)成的短語(yǔ)中，若賓語(yǔ)是代詞，代詞要放在動(dòng)詞和副詞中間，即“動(dòng)詞+代詞+副詞”，故選B。
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