改错-is your brother and sister workers?yes,they are

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改错-is your brother and sister workers?yes,they are
改错-is your brother and sister workers?yes,they are

改错-is your brother and sister workers?yes,they are
Is 改成 Are

Is are
主语是复数,所以用are

is-are,回答是yes,they are,意味着这里是are,而且workers也告诉我们这里是are

is 改成are
sister 后加s