問題詳情
22. You must keep on working in the evening ______ you are sure you can finish the task in time.
(A). as
(B). if
(C). when
(D). unless
(A). as
(B). if
(C). when
(D). unless
參考答案
答案：D
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)
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