Mary ____ ____in China since three years ago .填什么

问题描述:

Mary ____ ____in China since three years ago .填什么

has been
自三年前一直呆在中国,用现在完成时

has been

Mary _has___ __been__in China since three years ago .
玛丽在中国待了两年了.现在完成时表示从过去延续到现在.
Mary is (has been)in China since three years ago .