摘要：28． Mike was usually a mild-mannered boy, he stood up bravely to protect his younger sister when he saw her in danger． A．While B．Because C．Unless D．Before

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________ Mike was usually a mild-mannered boy, he stood up bravely to protect his younger sister when he saw her in danger．

A.
While
B.
Because
C.
Unless
D.
Before

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While

Because

Unless

Before

________ Mike was usually a mild-mannered boy, he stood up bravely to protect his younger sister when he saw her in danger．

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