单项选择题

He ______ in this company since he graduated from Andong Technical College ten years ago.

A. worked
B. has been working
C. had worked
D. was working
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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
He got a message from Mike ______ Professor Li couldn't see him the following day.
A. which
B. whom
C. that
D. what
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