Everyone should know ____ to save themselves when a fire breaks out.

A. whether
B. what
C. when
D. how
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科目：初中英語 來源：0101 模擬題 題型：單選題

Everyone should know ____ to save themselves when a fire breaks out.
[     ]
A. whether
B. what
C. when
D. how

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科目：初中英語 來源： 題型：

Everyone should know      to save themselves when a fire breaks out.

  A . whether   B . what   C. when   D. how

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