Students who took retrieval practice tests were less confident about their performance due to A.the former failures B.the struggle involved C.the difficulty of the materials D.the competitors' advantages
A.the B.the C.the D.the
【参考答案】
B 解析：第19段提到，或许这也解释了为什么参加回想考试的学生对自己一周后的表现情况较为缺乏自信，that is......