摘要: to explain → explain
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_________ to explain it, she would not believe him.
- A.However hard he tried
- B.However hard did he try
- C.How he tried hard
- D.However did he try hard
To explain the cause of radiation is beyond the ________of my knowledge.
- A.scope
- B.content
- C.application
- D.understanding
To explain what they have seen, the scientists build a theory about the way ________ things happen and the causes and effects.
- A.how
- B.that
- C.in that
- D.which