Ihavegotaheadache.Nowonder.You

-- I have got a headache.
-- No wonder. You_________ on the math exercises too long.

A．work

B．are working

C．have been working

D．worked

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A．set off

B．set down

C．set aside

D．set about

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A．should

B．might

C．mustn’t

D．couldn’t

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—Personally, I think it will exist along with home shopping but ________.

A．will never replace

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A．will have stolen

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C．should have stolen

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A．will put

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