单项选择题

We were all overjoyed at the news ______ the experiment turned out a success.

A. which
B. that
C. when
D. what
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单项选择题
Here are some toys. You can ______ one or two for your little son as a birthday present.
A. single out
B. pick out
C. work out
D. find out
单项选择题
They have developed techniques: which are ______ to those used in most factories.
A. simpler
B. better
C. superior
D. greater
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