Bài 15 BTVN
<h2><strong>Exercise 1: Give the verbs in the correct form of the past perfect tense.</strong></h2><p><br> </p><ol><li><strong>The robbers left / had left the bank when the policemen finally arrived / had arrived.</strong></li><li>When the rain <strong>started / had started </strong>, the Atkinsons <strong>finished / had finished </strong>planting trees.</li><li>By the time Rebecca <strong>wen