问题

They were ________ busy ________ with each other ________ the time.
A:too, to talk, to forget
B:too, talking, to forget
C:so, to talk, that they forgot
D:so, talking, that they forgot;
B:too, talking, to forget
C:so, to talk, that they forgot
D:so, talking, that they forgot;
正确答案是:
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