单项选择题

Robert was very unhappy for not to the wedding.

A．to be invited
B．inviting
C．having been invited
D．to have been invited
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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
单项选择题
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
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