4. This year the number of Internet users going online with a mobile device, such as a smartphone or a tablet,
overtook those doing so on a personal computer for the first time. And not surprisingly, e-commerce is ___.
(A) inflaming
(B) dwindling
(C) booming
(D) intensifying
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統計: A(23), B(10), C(260), D(25), E(0) #881397
統計: A(23), B(10), C(260), D(25), E(0) #881397