They_in_same grade选择 A:all are;a B：are all;the C:all are;\ D:all;the

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$They___in___same grade选择 A:all are;a B：are all;the C:all are;\ D:all;the$

They___in___same grade选择 A:all are;a B：are all;the C:all are;\ D:all;the
They___in___same grade选择 A:all are;a B：are all;the C:all are;\ D:all;the

They___in___same grade选择 A:all are;a B：are all;the C:all are;\ D:all;the
B

选择B，same grade“同一年级”前面应是定冠词