Exactly______ the potato was introduced into Europe is uncertain, but it was probably around 1565.
#30010
A
whether
B
why
C
when
D
how
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________ volleyball is her main focus，she's also great at basketball.(2011·北京)
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A
Since
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Once
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Unless
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The only way to succeed at the highest level is to have total belief_____ you are better than anyone else on the sports field.
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A
how
B
that
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The wounded soldier died ______I had a chance to know his name and family .So I can never give regards to any of his family or relatives.
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A
after
B
while
C
until
D
before