Since nobody gave him any help, he    have done the research on his own.
A．canB．mustC．wouldD．Need
B
考查情態(tài)動詞和虛擬語氣。can have done sth可能已經(jīng)做了某事；must have done sth一定已經(jīng)做了某事；would have done表示與過去的事實相反；need have done sth本來需要做某事。句意“因為沒有人給他任何的幫助，他一定是自己完成的那項，研究�！备鶕�(jù)，句意可知，表示的是肯定的推測，用must，故選B。
【考點定位】情態(tài)動詞和虛擬語氣。
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