We were ______ busy ______ with each other ______ the time.A.too, to talk, to forgetB.too, talking, to forgetC.so, to talk, that we forgotD.so, talking, that we forgot
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D解析so…that…，“如此……以至……”，so前面是连系动词时，后面接形容词，so前面不是连系动词时，后面接副词；be busy doing sth．“忙于做某事”。