问题

ildren,____ had played the whole day long, wereworn out.
A:all of what
B:all of which
C:all of them
D:all of whom
B:all of which
C:all of them
D:all of whom
正确答案是:
同类题型
he temperature down day by day, the leaves areturning yellow.
Itis reported that some wild animals were found ____ in a big cave in themountain
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The United States of America _____one of the most developed countries in the world.