Mary ____ ____in China since three years ago .填什么

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Mary________inChinasincethreeyearsago.填什么Mary________inChinasincethreeyearsago.填什么Mary________inChin

Mary ____ ____in China since three years ago .填什么
Mary ____ ____in China since three years ago .填什么

Mary ____ ____in China since three years ago .填什么
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 .

has been

has been
自三年前一直呆在中国,用现在完成时