单项选择题

Seeing that my brother was lost for an answer, I ______ to save the situation.

A. joined in
B. stepped in
C. took in
D. entered into
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单项选择题
He used so much jargon that I hadn't a ______ what he was talking about.
A. query
B. hint
C. thought
D. clue
单项选择题
The famous basketball player of American ______ chose to play for the country in which he had won the citizenship.
A. bent
B. descent
C. descendant
D. region
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