Is this book ______ I bought for you the day before yesterday?
A. which
B. that
C. ×
D. the one
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I'll remember the time ______ we spent together in the country.
A. that
B. when
C. during which
D. at which
The professor made his first speech ______ he talked about some subjects the students were interested.
A. that
B. which
C. in which
D. of which
In the dark street, there wasn't a single person ______ she could turn for help.
A. that
B. who
C. whom
D. to whom
I don't believe the reason ______ he has given for his being late.
A. why
B. that
C. how
D. what