This apple is _(big) than that one.

This apple is _(big) than that one.
This apple is _(big) than that one.

This apple is _(big) than that one.
根据题意是,比……更大.
应该用比较级.所以是bigger.

bigger

看到than用比较级

祝学习进步O(∩_∩)O
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bigger