26. Should students have questions regarding their assignments, they could write an email to make an appointment with the professor. The professor usually replies within three days as long as he is away on a business trip.
(A)Should
(B)regarding
(C)with
(D)within
(E)as long as
詳解 (共 1 筆)
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問題在於第二句話的"as long as...
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