_________, ozone levels in the ionosphere appear to have dropped recently.

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问题 _________, ozone levels in the ionosphere appear to have dropped recently.

选项 A、However the reason
B、It is the reason
C、What is the reason
D、whatever the reason

答案D

解析 连接副词“whatever”=“regardless of”。例如:1.He wore antique clothes and,whatever the weather,galoshes... 2.It is always the same story,whatever the cultural variation.
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