Although we may not realize , when we talk with others we make ourselves understood not just by words but also by body movements.
A. it
B. them
C. that
D. ourselves
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(答案→)A. it
B. them
C. that
D. ourselves
解析：句意:虽然我们可能没有意识到,当我们与人交谈的时候，我们不仅通过话语让自己被理解还通过身体动作。这里指代的是when后面的从句，所以用it，泛指一种情况，them指代可数名词复数，that特指可数名词单数或不可数名词，ourselves我们自己，所以选A.