1. 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
大全注释说只有forbid to do,所以选C。 但朗文上却有forbid sb to do和forbid sb from doing两个用法, 哪位能解释一下？谢谢
In Gmat rules, "forbid sb. to do sth." is more proper.
Another one is "prohibit sb from doing". And those two terms are not inter-changable.
Longman doesn't explain the difference between "forbid doing" and "forbid to do". I found the following source on google that may clear the myth a little bit.
http://book.learning.sohu.com/chapter.php?id=1800&volume=4&chapter=1
forbid (forbade; forbidden)动词，表示“禁止，不许”之意。常有如下用法：
forbid sb. to do sth.(禁止某人干某事)；forbid doing sth.(禁止干某事)此用法常用于被动语态。
forbid sb. sth.(禁止某人某事、某物)；forbid that clause (禁止……)。
The law forbade the workers to march at that time. 当时的法律禁止人们游行。
Smoking was forbidden in the meeting hall.=People forbade smoking in the hall.
大厅里禁止吸烟。
His parents forbid him wine and cigarettes.父母禁止他吸烟和喝酒。
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