兩題文法(關於aim)

1.Today, however, appellation of place is a marketing exercise ____ at pushing consumer hot buttons. (A) aiming (B)aimed 2.Some patients have benefited as doctors discover genes driving tumor growth and prescribe drugs ___ at those genes. (A) aiming (B)... 顯示更多 1.Today, however, appellation of place is a marketing exercise ____ at pushing
consumer hot buttons.
(A) aiming (B)aimed

2.Some patients have benefited as doctors discover genes driving tumor growth and prescribe drugs ___ at those genes.
(A) aiming (B) aimed

兩題的答案都是(B)aimed,我想問的是這兩題應該都是主動瞄準,應該用aiming
為什麼是用aimed?


感謝大家^^
4 個解答 4