单项选择题

Each leader had a solemn look as he signed the peace treaty.（）

A. sincere
B. grave
C. honest
D. suspicious

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单项选择题
They joined the army willingly.（）

A. intentionally
B. consciously
C. voluntarily
D. reluctantly
单项选择题
He boasted that he was the best swimmer in his school.（）

A. bragged
B. alleged
C. claimed
D. praised
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