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
The scheme was so impracticable that I refused even ______.
A．to consider supporting it
B．considering to support it
C．to considering to support it
D．considering supporting it
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
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