he has onr blue pen and two red a.one's b.thoes c.one d.ones

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he has onr blue pen and two red a.one's b.thoes c.one d.ones

d
ones 代替上文出现过的复数的人或物,以避免重复.本句ones 代替pens

He has one blue pen and two red _? a.one's b.thoes c.one d.ones
选d.
句意:他有一只蓝色钢笔和两只红色(钢笔)。
ones 是one的复数。two red ones=two red pens.

d 省略或叫替代