21. Advertising _____ young adults can be destructive, so it should be controlled.
(A) aimed at
(B) is aimed at
(C) has been aiming at
(D) is aiming at
(E) aim at

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統計： A(61), B(17), C(0), D(0), E(3) #2277043

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看到後面有動詞can 選項BCDE就可以...
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