单项选择题

Professor Wang, () for his informative lectures, was warmly received by his students

A. knowing
B. known
C. to be known
D. having known

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If people feel hopeless, they don’t bother to()the skills they need to succeed

A. adopt
B. acquire
C. accumulate
D. assemble
单项选择题
We look forward to () to the opening ceremony.

A. invite
B. be invited
C. having been invited
D. being invited
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