B.could常用于表示较客气委婉的看法、提问及用于虚拟语气的结构中.这时候,could不可以看作是can的过去式,而是could自己独特的用法.如：
Could you speak a little slowly 您能稍微说慢一点儿吗?
本题中也是这种用法.
( ) you please help me?A.Can B Could C May D.Shall
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