Professor Li is the person to ____________ you should write.
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A
whom
B
who
C
which
D
whose
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6. I'll give you my friend's home address, _________ I can be reached most evenings. 7.
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A
which
B
when
C
whom
D
where
_____several times，but unfortunately，the boy still couldn’t smooth away the problem on his own.
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A
Having been explained
B
The problem having been explained
C
The problem had been explained
D
Although the problem had been explained
____ has finished the work ahead of time will be rewarded though we don't know who it will be.
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A
Those who
B
Anyone
C
Whoever
D
No matter who
The book was written in 1946, the education system has witnessed great charges.
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A
when
B
during which
C
since then
D
since when