understand后面缺宾语,不定式和动名词可以作宾语.
但是不定式作宾语必须是词组形式,如want to do等,同时,不定时的逻辑主语要用for sb to do.没有understand to do这个词组.
动名词加逻辑主语要用one's doing,口语情况也有用sb doing但不正规.
而postpone doing是个词组.
当我们理解他为什么推迟做决定时已经太晚了.
综上所述,D.
We can't understand ____a decision until it is too late
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