15. That app _______ downloaded over 500 million times ever since it was created.
(A)is
(B)was
(C)has been
(D)would be

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統計： A(1), B(0), C(6), D(0), E(0) #3851488

詳解 (共 1 筆)

#7509719
【答案】 C. has been 【題...
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