Affording strategic proximity to the Strait of Gibrattar, 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.
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.wihtout 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.
答案：B
感觉B中it指代不是很明确，具体指代的是？
请教，谢谢！
唉，帖子沉了，自己顶一下吧，55555555555
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