An idea came to him ___ he might do the experiment in another way.
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A
which
B
when
C
what
D
that
推荐题目
China has hundreds of islands, ___________ is Taiwan Island.
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A
among them the largest
B
and the largest of which
C
and the largest of them
D
but in which the largest
Unless __________, she won’t go to any party. 
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A
inviting
B
having invited
C
invited
D
being invited