大全 sec-D-18

The National Labor Relations Act expressly forbids unions from engaging in secondary boycotts against companies not directly involved in a labor dispute.

(A) unions from engaging in

(B) the engagement by unions of

(C) unions to engage in

(D) unions from becoming engaged with（C）

(E) that unions engage upon

我查字典forbid有 forbid Sb from doing Sth 也有 forbid Sb to do Sth

就是這題AC的用法....請問各位nn...為什麼要選C呢????請指教,感謝感謝

这里查字典也没用，ETS只认一种用法，见OG100的解释:

Either of the following constructions would be idiomatic here: x forbids y to do z or x prohibits y from doing z.