14. _______serious crisis for many cities is disposal of the waste products of city
life.
(A) A
(C)There is a
(B) It is a
(D)What a
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統計: A(11), B(0), C(4), D(8), E(0) #2994361
統計: A(11), B(0), C(4), D(8), E(0) #2994361