This outdoor training is an exercise  , as we know, teenagers' confidence can be built.
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A
which
B
what
C
that
D
where
推荐题目
 He left Europe _____ World war II broke out.
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A
during
B
the year
C
while
D
there
He was working on a new book ________ I went to see him.
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A
first time
B
for the first time
C
by the first time
D
the first time