修改这两个英语句子?因为如果你用'while'在最前头,应该有','和句子.
eg While I was using this phone,my mum called me suddenly.
She had receive an award for new best pop singer.(过去完成时 'had received' 只应使用在在过去里,一个完成的动作发生在另一个动作之前)
She has received an award for new best pop singer.
选择题:C