27、--- I haven’t heard from my sister since last month.
--- Don’t worry, Janet. Letters from abroad _____ be slow sometimes.
A. need to B. can C. should D. ought to
科目：高中英語 來源： 題型：
--- I haven’t heard from my sister since last month.
--- Don’t worry, Janet. Letters from abroad _____ be slow sometimes.
A. need to B. can C. should D. ought to
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