Do you know how much time and effort they devoted________ such a complicated project?  
A．to completeB．completedC．completingD．to completing
D
考查非謂語(yǔ)動(dòng)詞。定語(yǔ)從句的謂語(yǔ)動(dòng)詞與前面的先行詞之間構(gòu)成devote time and effort to doing sth.故答案為：D。
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