Hello,<br/><br/>a. The ears of a rabbit are longer than <b><span style="color:#800000;"><span style="color:#800000;">those </span></span></b>of a dog.<br/>b. The ears of a rabbit are longer than <b><span style="color:#800000;">that </span></b>of a dog.<br/><br/>Is the use of "that" in (b) wrong?<br/>Does "that" work as a plural referent?<br/>Is it safe to use "that" as a plural referent?<br/><br/>Regards