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Blackholes

欄目: 練習題 / 釋出於: / 人氣:1.56W

問題詳情：

Blackholes

Black holes _____ not be seen directly, so determining the number of them is a tough task.

A. can B. should C. must D. need

【回答】

A

知識點：情態動詞

題型：選擇題

Tags：Blackholes

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