Is this the school __you worked during the summer vacation?
A. that
B. which
C. when
D. in which
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That is the reason ____he wasn't here yesterday.
A. which
B. why
C. on which
D. in which
I still remember the day ___I first came to the college.
A. at which
B. in which
C. on which
D. which
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