40．一Look at the four signs．Which sign tells us the way out of a building? 一It’s ．——青夏教育精英家教网—

摘要：40．一Look at the four signs．Which sign tells us the way out of a building? 一It’s ．

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一Look at the four signs．Which sign tells us the way out of a building?

一It’s _______ ．

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