选词填空（can't have been\must be\must have been\can't be \may have been\may be)

Question

He was in hospital yesterday.He___ill.
She has eaten a lot of meat at lunch.She____very tired.
He has eaten a lot of meat at lunch. He___seriously ill.
Bob___to Tokyo.He knows nothing about the place at all.
Where is Harry？ He___in his room.I'm not sure.
Why was he late?He___busy.I'm not sure.

Answer 1

may be

must be

can‘t be

can’t have be

may be

may be

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