4. According to the article, what does the idiom “hole in the wall” experiment mean?
(A) a very fancy and expensive experiment
(B) an experiment that has failed
(C) a modest and inexpensive experiment
(D) an experiment that has succeeded

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統計： A(5), B(4), C(141), D(55), E(0) #586873

詳解 (共 2 筆)

#2195446
a hole-in-the-wall /...
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#925385
holes in the wall A small, very modest, often out-of-the-way place.
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