It's difficult _ (tell) the difference between the two flowers.

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It''sdifficult_(tell)thedifferencebetweenthetwoflowers.It''sdifficult_(tell)thedifferencebetweenthetwo

It's difficult _ (tell) the difference between the two flowers.
It's difficult _ (tell) the difference between the two flowers.

It's difficult _ (tell) the difference between the two flowers.
To tell