19. The teacher’s six-month practical training at a local middle school proved ________ to his professional knowledge and teaching skills.
(A) value
(B) valued
(C) valuing
(D) invaluable
詳解 (共 2 筆)
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prove + 形容詞是…例句:The ...
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The teacher’s six-mo...
私人筆記 (共 1 筆)
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解題關鍵:prove的用法 The ...