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Do you know how much time and effort they devoted___________such a complicated project ? 
A．to completeB．completedC．completingD．to completing
D

試題分析：考查固定詞組：devote sth to doing花費(fèi)/投入…做….句意：你知道他們花了多少時(shí)間和精力完成這樣復(fù)雜的過(guò)程。選D。
點(diǎn)評(píng)：英語(yǔ)中有的詞組里的to是介詞，不是不定式，如：be accustomed to doing ，get down to doing，be addicted to doing等，要記清楚，并靈活運(yùn)用。
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