选C
could 和can 开头是祈使句 也就是请求句 could是更委婉一些 can就比较大众化的口语化
你可以把这个句子写上黑板吗?
A和B如果要开句子开头 Being be XX 不是动词原形.
____you write the sentence on the blackboard?A.Be able toB.B
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