题目内容

He considered studying medicine but fainted ____________ blood, so he switched to civil engineering.

A. at the sound of
B. at the thought of
C. at the sight of
D. at the smell of

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The exhibition has been held ______________ World Press Freedom Day annual celebration.

A. on the occasion of
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A. on the occasion of
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A. at the sound of
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A. on the occasion of
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