—Miss Green’s new dress looks smart.     
—I wonder what it was        of.
A．madeB．builtC．doneD．produced
A

試題分析：根據(jù)語境可知此句的含義是我想知道它是用什么制作的。考查的是固定短語be made of表示有什么制成的，因是被動語態(tài)故用過去分詞。故選A。
點評：：對于固定句型，需要在平時的學習中強化記憶，熟練掌握其用法。尤其是動詞的非謂語形式是考查的重點。熟練并準確的掌握他們的結(jié)構(gòu)可以提高做題的效率。
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