问题
选择题
They peasants did what they____ the crops, but failed.
A．could save
B．could saving
C．could to save
D．could saved
答案
答案：C
考查句子结构。从句what they could(do)作动词did的宾语，不定式to save the crops作全句的目的状语。防止误选A.
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