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The Math problem is too difficult , we really don’t know ________ to do it .
A．whichB．whereC．whatD．how
D

試題分析：句意：這道數(shù)學題太難了，我們真的不知道怎么做。A. which哪一個； B. where 哪里；C. what 什么；D. how怎樣，根據(jù)句意，故選擇D。
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