22.George at first had difficulty swimming across the pool, but he finally succeeded on his fourth _______.
(A) attempt
(B) process
(C) instance
(D) display

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統計： A(1), B(1), C(0), D(0), E(0) #3341167

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#6280224
喬治一開始很難游過游泳池，但他最終在第四...
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