21. Software that blocks ads with browsers or apps cuts two ways: it reduces clutter for the viewer, but it also reduces revenue for websites that survive on the sales of those ads.
(A) with
(B) cuts
(C) clutter
(D) on
(A) with
(B) cuts
(C) clutter
(D) on
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統計: A(180), B(101), C(52), D(91), E(0) #1367616
統計: A(180), B(101), C(52), D(91), E(0) #1367616