25.There are still serious debates about whether mobile phone use______ safe.
(A) are
(B) is
(C) have been
(D) will have been

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統計： A(27), B(328), C(55), D(19), E(0) #2336815

詳解 (共 1 筆)

#4595220
可以用刪去法，mobile phone是...
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