21. 計程車司機總是無法預知自己能賺多少錢。
(A) Taxi drivers never know how much they'll earn.
(B) Taxi drivers always don't know how much they'll earn.
(C) A taxi driver don't always know how much money they'll make.
(D) A taxi driver couldn't know how much they had earned.
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統計: 尚無統計資料
統計: 尚無統計資料