I still remember the day ___I first came to the college.
A. at which
B. in which
C. on which
D. which
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Can you tell me the name of the factory___ you visited last week?
A. what
B. where
C. /
D. when
the professor, _____ as a splendid speaker, was warmly received by the students.
A. To be known
B. knowing
C. known
D. having known
Where are the____ seat?
A. reserving
B. reserved
C. to be reserving
D. having reserved
__their homework, they went out to play.
A. Finished
B. Finishing
C. Being finished
D. Having finished