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【单选题】
执行下列输入456<空格>789<空格>123<回车>，输出结果是（ ）。#include A.
456, 789, 123
B.
4, 56, 789, 123
C.
4, 789, 123
D.
4, 56, 789
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【简答题】在语音识别中,按照从微观到宏观的顺序排列正确的是()。 A帧-状态-音素-单词 B帧--音素-单词-状态 C音素-单词-状态-帧
【单选题】It ______ around nine o'clock when I drove back home because it was already dark.
A.
had to be
B.
was to be
C.
must have been
D.
must be
【单选题】It was already lunchtime, so we sat down there was a nice garden and ate something.
A.
before
B.
unless
C.
that
D.
where
【单选题】It ( ) around six o'clock when I drove back yesterday because it was already dark.
A.
must have been
B.
must be
C.
was to be
D.
had to be
【单选题】It was already midnight _____ they arrived at the village at last. [ ]
A.
since
B.
before
C.
while
D.
when
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