问题
选择题
The possibility____ pleasant smells might reduce pain has recently been suggested by new research.
A．which
B．why
C．that
D．whether
答案
答案：C
搜题请搜索小程序“爱下问搜题”
The possibility____ pleasant smells might reduce pain has recently been suggested by new research.
A．which
B．why
C．that
D．whether
答案：C