单选题
He expressed his
gratitude
to her for her favorable help with the experiment.
A、
congratulations
B、
sphere
C、
thanks
D、
sympathy
【正确答案】
C
【答案解析】
gratitude感激，感谢；congratulations祝贺；sphere球，天体；thanks感谢；sympathy怜悯，同情。
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