Today,whenscientistsexaminemum

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Today, when scientists examine mummies, they wear special clothing for protection _____ they breathe in harmful gas.

A．even though

B．in case

C．until

D．unless

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A．what

B．that

C．which

D．Why

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—Sorry, he isn’t in. This is his assistant speaking. Can I help you?.
—______.

A．Oh, you can	B．Oh, it’s a pity
C．I hope to see him soon	D．I should think so

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A．As

B．For

C．With

D．Through

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A．when, that	B．that, which
C．when, which	D．that, when

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A．keep out

B．keep off

C．keep up

D．keep back

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