单项选择题

I didn't go to his party last night, because ______ I changed my mind.

A. on a second thought
B. on second thought
C. by second thought
D. on the second thought
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单项选择题
______ man can now create radioactive elements, there is nothing he can do to reduce their radioactivity.
A. As
B. Whether
C. While
D. Now that
单项选择题
Doctors are often caught in a ______ because they have to decide whether they should tell their patients the truth or not.
A. puzzle
B. perplexity
C. dilemma
D. bewilderment
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