He trained hard in puzzle-guessing, a sort of children’s game, all year, still failed to reach his best form in all the tests given to both adults and children.
A. Then
B. Thus
C. Therefore
D. Yet
网友回答
A. Then
B. Thus
C. Therefore
(答案→)D. Yet
解析：连词辨析。 A.那么，然后 B.因此，从而；C.因此，所以； D.但是，然而。句意：他整年刻苦练习猜谜游戏，一种儿童游戏，但是在所有给大人和孩子们的测试中他仍旧没有达到最佳状态。前后为转折关系，故选D。