______ to speak at the convention, Dr. Smith prepared some notes.A、Being askedB

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问题 ______ to speak at the convention, Dr. Smith prepared some notes.

选项 A、Being asked
B、Has been asked
C、Having been asked
D、Is asked

答案 C

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______tospeakattheconvention,Dr.Smithpreparedsomenotes.A、BeingaskedB