OG_SC_57求教~~ 谢谢！！

57. Affording strategic proximity to the Strait of Gibraltar, Morocco was also of interest to the French throughout the first half of the twentieth century because they assumed that if they did not hold it, their grip on Algeria was always insecure.

(A) if they did not hold it, their grip on Algeria was always insecure

(B) without it their grip on Algeria would never be secure

(C) their grip on Algeria was not ever secure if they did not hold it

(D) without that, they could never be secure about their grip on Algeria

(E) never would their grip on Algeria be secure if they did not hold it

OG给的官方解释是E中的it指代不明。如果这样的话，那B中的it就指代明确了？麻烦大家帮忙看看，谢谢！

我的看法是it指代前面出现的单数名词.在B中,it前面只有Morocco,不会有指代不明的问题.而在E中,it之前有Morocco和grip两个单数名词,所以会有指代不明确的问题.