These fiowers ( ) me 100 dollars.A.costed B.cost C.code

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These fiowers ( ) me 100 dollars.A.costed B.cost C.code
各位前辈不好意思,我英语差,这种题到底要怎做,是选一般现在时态,还是过去时态,我对这类题很疑惑,请个位解释开导我下.
要是不是cost，是其他规则的动词呢？是理解为现在时态还是过去时态？我最搞不清楚的就是这个东西

cost 是一个不规则动词,即cost-cost-cost,这样看来,A就错了,因为根本没有这种形式.code 是密码的意思,因此选B,是过去时,强调买花时的情况.整句话意思：这些花儿花了我100美元.
补充：
就你提供的句子而言,不管是什么动词,都要用过去时.

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