单项选择题

______ that Bob had got promoted, his friends came to congratulate him.

A. Heard
B. Having heard
C. Hear
D. To hear
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单项选择题
It’s my great honor ______ to give a speech at the opening ceremony.
A. to invite
B. inviting
C. having invited
D. to be invited
单项选择题
We could not have fulfilled the task in time if it ______ for their help.
A. was not
B. is not
C. had not been D. has not been
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