10. New staff have a ________________ period of fourteen weeks before their contract is made permanent.
(A) unconditional
(B) heuristic
(C) empirical
(D) probationary
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統計: A(43), B(24), C(62), D(316), E(0) #2905534
統計: A(43), B(24), C(62), D(316), E(0) #2905534