(2013·高考新課標全國卷Ⅱ)Since nobody gave him any help，he________have done the research on his own.
A．can　　　　　　　B．must
C．wouldD．need
B
選B。分析主從句邏輯關系，主句是對從句表達的原因的一種猜測，must have done想必/準是/一定做過某事，符合主從句之間的邏輯關系。本題句意為“既然沒人給他幫忙，那他肯定是自己做的研究”。can have done 用于疑問句或否定句中，表示對過去情況的推測；would have done表示過去將來完成時或用于虛擬語氣中；need have done 通常用于否定句和疑問句中，表示“本不必做某事卻做了”。
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