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So far no life has been found on Mars, but some experts still think that there s

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So far no life has been found on Mars, but some experts still think that there s

So far no life has been found on Mars, but some experts still think that there ________ some form of life a long time ago．

[]A．

might be

B．

may have been

C．

should have been

D．

could be

试题答案

答案：B

标签：butmarsonstillexperts

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