How many sharks ( ) (be)there in this pool last year?用适当形式提问,带讲解.

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How many sharks ( ) (be)there in this pool last year?用适当形式提问,带讲解.
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How many sharks ( ) (be)there in this pool last year?用适当形式提问,带讲解.
How many sharks ( ) (be)there in this pool last year?用适当形式提问,带讲解.

How many sharks ( ) (be)there in this pool last year?用适当形式提问,带讲解.
were
由last year可知要用一般过去时态,再由sharks可知主语是复数,所以用were.

How many sharks (were ) (be)there in this pool last year