That because the dreamer is worrying about something. Sometimes dreaming is away of trying to find an answer.
- A.may be
- B.maybe
- C.can’t be
- D.must do
答案
正确答案：A
知识点：情态动词
句意：那可能是因为做梦者正担心什么事情。有时候做梦是一种试图找到答案的方式。根据句意表示不确定的猜测用may，又因主句缺少谓语，所以用may be，maybe副词，can’t表否定猜测，must表肯定猜测，正确答案为A。
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