Their debts _______ 100 million yuan.

Their debts _______ 100 million yuan.
A、added to
B、adds up
C、add to
D、add up to
【正确答案】：D
【题目解析】：add to 增加到；add up 合计；adds up to 合计达; 句意为：他们的债务加起来有1亿日元。因此，D 符合题意。