Walt, feeling a bit tired, decided to stop off in Hong Kong on the way to Singapore.
A. briefly
B. constantly
C. finally
D. gradually
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(答案→)A. briefly
B. constantly
C. finally
D. gradually
解析：考查副词的区别。A 短暂地； B 不断地； C 最后； D 不断地；根据句意：瓦特感到有点累，决定在回新加坡的途中在香港短暂停留。故A正确。