问题
_____ many times, but he still doesn’t know how to operate the machine properly.
A:Although I have shown him
B:I have shown him
C:Having been shown
D:Having shown
B:I have shown him
C:Having been shown
D:Having shown
正确答案是：
同类题型
______was your trip to Mount Emei, Alice?一 It was great! We-really had a good time there.
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Can you your bookme, Lily? Yes, I can.
My brother lost the speaking contest. He looked _____.
They haven’t finished their work. Maybe they have some trouble ______ it. [ ]