单项选择题

was Sam aware that he was in danger.

A．When he entered the forest
B．After he had entered the forest
C．Only after entering the forest
D．Upon entering the forest
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David did not tell his wife that he had been fired, but he .
A．would do
B．had to
C．should have
D．might have to
单项选择题
Many a mountain and many a river visited by the guests.
A．have been
B．were
C．was
D．are
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