－Areyousureyouhaveto?It’sbeens

－Are you sure you have to? It’s been so late. Make it another time?
－I don’t know ________ I can do it if not now.

A．how

B．what

C．when

D．that

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相关试题

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A．have they known; get	B．did they know; were going to get
C．do they know; are going to get	D．had they known;got

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--Is ___ here? –No, Bob and Tim have asked for leave.

A．anybody

B．everybody

C．somebody

D．nobody

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In some parts of the world, tea __ with milk and sugar.

A．is serving

B．is served

C．serves

D．served

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If you keep on, you’ll succeed___.

A．in time

B．at one time

C．at the same time

D．on time

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Charles Babbage is generally considered __ the first computer.

A．to have invented

B．inventing

C．to invent

D．having invented

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