Question

() you are tired and hungry after a day's work

Amay be
Bmust be
C can be
Dmaybe

Answer 1

选D。maybe
由于句子中有are 这个系动词了，所以前面不能再出现系动词be，所以排除ABC，
maybe 是副词，表示也许。
翻译：工作了一天，也许你是又累又饿。

Answer 2

D.想必你是对AD有疑问？详解一下AD.
A的意思是“可能是”，例句：He may be in the classroom.他可能在教室里。
D意为“可能”。对比一下：Maybe he is in the classroom.
may本身也是“可能”之意，再加上be（是），就不难理解了。
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Answer 3

D maybe
Maybe you are tired and hungry after a day's work 这里 maybe 是副词