单项选择题

there was an epidemic approaching, Mr. Smith the invitation to visit that are

A． If he knew, would have declinedB. If he had known, would declineC. Had he known, would declineD. Had he known, would have declined

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单项选择题

British hopes of a gold medal in the Olympic Games suffered ______ yesterday, when Hunter failed to qualify during the preliminary heats.

A．a sharp set-back
B．severe set-back
C．a severe blown-up
D．sharp blown-up

单项选择题

The concept of internet, ______ has intrigued scientists since the mid-20th century.

A．the transmission of images, sounds and messages over distances
B．transmitting of images, sounds and messages along distances
C．to transmit images, sounds and messages on distance
D．the transmissibility of images, sounds and messages for distances

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