_____ many times, but he still doesn’t know how to operate the machine properly.
A．Although I have shown himB．I have shown him
C．Having been shownD．Having shown
B
考查句子結(jié)構(gòu)。因?yàn)榫渥又杏衎ut,所以前面也應(yīng)該是一個(gè)句子。答案為A。如果本題沒有but,答案就應(yīng)該是C。句意：我已經(jīng)給他展示過很多次了，但是他仍然不知道怎么樣恰當(dāng)?shù)夭僮鳈C(jī)器。
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