He opened the envelop, had it_____ and began to read it.
A．unfoldingB．foldingC．unfoldedD．folded
C
考查非謂語動詞。Unfold展開；fold折疊；合攏。句意：他打開了信封，把信展開開始閱讀。使役動詞加動詞的過去分詞表示把某事做了。結(jié)合語境可知是展開信，故選C。原答案有誤。
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