67. 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
请大家帮我看看，这道题的正确答案是B，但是D里面的without that，that为什么不对，为什么一定要用it呢？
非常感谢！
D 中it和that的问题我解释不了，我认为d最大的问题在于后面的be secure about 这个说法应该是awkward的。secure有动词和形容词词性。如果要加宾语，可以直接涌动词形式。
谢谢！不知谁能否跟我解答一下。it 和that 的区别
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