单项选择题

The monument was constructed in honor of the explorer who was believed ______ the river.

A．to have discovered
B．to have been discovered
C．to discover
D．having been discovered
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单项选择题
If the horse wins tomorrow, he ______ twenty races in the past three years.
A．will win
B．will have won
C．would have won
D．has won
单项选择题
The mad man was put in the soft-padded cell lest he ______ himself.
A．injure
B．had injured
C．injured
D．would injure
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