<br/><br/><b>—<b>Have you thought of a topic yet</b>? </b><br/><br/>— <b>No, I ________a lot about it, but I haven't decided. </b><br/><br/><b>A. thought B. have been thinking</b><br/><br/><b></b><br/><br/><b>The suggested answer is A.</b>