—Johnhasputforwardmostchalleng

— John has put forward ______ most challenging question for us to answer.
— Yes, it really is. I have never heard ______ harder one.

A．a; the	B．the; the
C．a; a	D．the; a

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相关试题

I happened __________ with him when he was hit by a stone.

A．I was talking

B．talking

C．to talk

D．to be talking

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You'd better not phone me between two and six o'clock this afternoon; I __________ a speech then.

A．will give

B．will have been giving

C．will be giving

D．will have given

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By the middle of the 21st century, the vast majority of the world's population __________ in cities rather than in the country.

A．are living

B．will be living

C．have lived

D．will have lived

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-I will call on you at 9:00 tomorrow morning.
-Sorry, I __________ the flight to Sanya then.

A．have enjoyed

B．will be enjoying

C．am enjoying

D．am to enjoy

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My wife __________ the night shift when my plane __________. That's why no one is to meet me at the airport today.

A．will be working; arrives

B．was working; arrived

C．will have worked; has arrived

D．is working; is arriving

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