He spent lots of time doing this experiment (it)

<div class="content-answer-1 enable-event-click" style="overflow-x:auto;text-justify:inter-word;text-align:justify"><p>→<span>It + take + (pro) noun + Noun of time + to infinitive ...</span></p><br /><p><span>*Take là chia theo thì<br><strong>→It took him lots of time to do this experiment</strong><br></span></p></div><div class="pt12"><div></div></div>