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Do you know how much time and effort the...

Do you know how much time and effort they devoted________ such a complicated project?  

A.to complete

B.completed

C.completing

D.to completing

 

D 【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。
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