问题
选择题
They were surprised that a child should work out the problem _____ they themselves couldn’t.
A．when
B．where
C．until
D．while
答案
答案：D
考查连词辨析。while是个并列连词，表示“转折”，而其它连词均没有转折之意。句意：他们很惊讶一个孩子能够解决出这个问题，而他们不能够。
搜题请搜索小程序“爱下问搜题”