the first exercise should be done in class and the rest __at home a is to be doneb are to be done请做出解释~

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the first exercise should be done in class and the rest __at home a is to be doneb are to be done请做出解释~

the first exercise should be done in class and the rest __at home a is to be doneb are to be done请做出解释~
the first exercise should be done in class and the rest __at home a is to be done
b are to be done
请做出解释~

the first exercise should be done in class and the rest __at home a is to be doneb are to be done请做出解释~
a .is to be done

b。。 are to be done