What's this?
What happened on earth?（on earth 是究竟、到底的意思）
What is this?
What happened anyway?
what is this? what's happening on earth?
what is this
what's wrong
What's this? 或what it is？（表示强烈一些的语气）
What has happened on earth?（on earth 是究竟、到底的意思)
1. what is this ?
2.what have happended on earth ?
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