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【单选题】
“海上生明月,天涯共此时”的作者是A.
B.
苏轼
C.
马致远
D.
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【单选题】— Linda had nothing for breakfast this morning, ______? — No. She got up too late. [ ]
A.
had she
B.
hadn't she
C.
did she
D.
didn't she
【单选题】—Alice had nothing for breakfast this morning, ________? —No. She got up too late. [ ]
A.
had she
B.
hadn't she
C.
did she
D.
didn't she
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【简答题】正弦交流电在0.1s的时间内变化了5周,则它的周期等于____,频率等于_______,角频率等于________。
【单选题】The train ______ she was traveling was late. [ ]
A.
on that
B.
for which
C.
on which
D.
which
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