I don't know ___ or ___ he is; and I don't care.
A. who...whose
B. who...what
C. whose...whom
D. who...who
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All ___ glitters is not gold.
A. what
B. that
C. those
D. which
The only thing ___ really matters to the children is how soon they can return to their aunt and uncle's farm.
A. what
B. that
C. which
D. of which
___ were known as "barefoot doctors" were not barefooted.
A. Those
B. What
C. Which
D. Of which
___ one of the two boys wants to try.
A. Each
B. Every
C. No
D. Some
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