The most important reason for animals _____ is the part that humans have _____.

题目

The most important reason for animals _____ is the part that humans have _____.
A.dying out … played B.die away … make
C.died off … done D.to die down … played
please explain

答案

选A
die out是"灭种",die away 和die down都要"逐渐减弱直至消失"的意思,而die off是"相继死去".
for sb./sth后面要加to do sth或者doing sth.
结合上面的意思和语法,只有A是正确答案.