用所给动词的适当形式完成下列句子some______(do),but some_______(not do)when______the first class _____(begin)?each class_____(be)forty minutes long.

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用所给动词的适当形式完成下列句子some______(do),butsome_______(notdo)when______thefirstclass_____(begin)?eachclass___

用所给动词的适当形式完成下列句子some______(do),but some_______(not do)when______the first class _____(begin)?each class_____(be)forty minutes long.
用所给动词的适当形式完成下列句子some______(do),but some_______(not do)
when______the first class _____(begin)?
each class_____(be)forty minutes long.

用所给动词的适当形式完成下列句子some______(do),but some_______(not do)when______the first class _____(begin)?each class_____(be)forty minutes long.
1 do ,don't
2 does ,begin
3 is
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