大全785, D-18请教

785       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

大全注释说:785, D-18

forbid…to do…只有C正确。

而且也没有讨论连接,看来大家都这么认为

可我从longman查到:

for‧bid past tense forbade past participle forbidden present participle forbidding [transitive]

1 to tell someone that they are not allowed to do something, or that something is not allowed [≠ permit]

forbid somebody to do something

He was forbidden to leave the house, as a punishment.

forbid somebody from doing something

Women are forbidden from going out without a veil.

请教如何排除a?

788.        The new contract forbids a strike by the transportation union.

(A) forbids a strike by the transportation union

(B) forbids the transportation union from striking

(C) forbids that there be a strike by the transportation union

(D) will forbid the transportation union from striking（A）

(E) will forbid that the transportation union strikes

真够无聊的......