单项选择题

21（）

A．because
B．however
C．besides
D．therefore

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单项选择题
Why was Helen Keller blind, deaf and unable to speak（）

A．Because she’d been born that way.
B．Because a horse had kicked her.
C．Because she’d had a very high fever.
D．Because she’d had a bad fall.
填空题
Tony: Would you be interested in going for a picnic with us on Saturday Tom: （） But I have to hand in my term paper next Tuesday, you know.
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