问题

I had to buy ________ these books because I didn’tknow which one was the best.
A: all
B:none
C:both
D: neither
B:none
C:both
D: neither
正确答案是:
同类题型
I can’t find my dictionary anywhere.— You _____ have lost it while studying in the library.
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ve is _____to the public, high up the face of a cliff which no one can climb.