Because of the Great Lakes,they(learn),Canada(have)more fresh water than any other country in the world.括号内的词应填什么形式?

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Because of the Great Lakes,they(learn),Canada(have)more fresh water than any other country in the world.括号内的词应填什么形式?

Because of the Great Lakes,they(learn),Canada(have)more fresh water than any other country in the world.括号内的词应填什么形式?
Because of the Great Lakes,they(learn),Canada(have)more fresh water than any other country in the world.括号内的词应填什么形式?

Because of the Great Lakes,they(learn),Canada(have)more fresh water than any other country in the world.括号内的词应填什么形式?
learned has

现在时形式: have learned... has

learned has

learned has