Why pleasant smells do not reduce pain in man is a question still _______ by scientists.
#97245
A
answered
B
being answered
C
to be answered
D
that answered
推荐题目
I was disappointed to spot the seller ________ in the deal and decided to deal with another one.
#95804
A
to cheat
B
cheating
C
cheat
D
cheated
You can not imagine a child ________so cruelly.
#94256
A
to treat
B
treating
C
being treated
D
to be treated
