Do you know how much time and effort they devoted such a plicated project?
A. to plete
B. pleted
C. pleting
D. to pleting
网友回答
A. to plete
B. pleted
C. pleting
(答案→)D. to pleting
解析：考查非谓语动词。定语从句的谓语动词与前面的先行词之间构成devote time and effort to doing sth.故答案为：D。