What()this?A bus?的()里用动词be怎么填

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What()this?A bus?的()里用动词be怎么填
What()this?A bus?的()里用动词be怎么填

What()this?A bus?的()里用动词be怎么填
What(is )this?A bus?
因为后面有【this】主语是单数,所以用is作为谓语动词

is

What (is) this?

is