After years of research, he found the key ____ differences between species.
#5237
A
to explain
B
to explaining
C
of explaining
D
explaining
推荐题目
There is no _______ in persuading him to give up computer games.
#5264
A
doubt
B
point
C
wonder
D
value
The police have issued a detailed ____________ of the missing boy.
#6476
A
direction
B
expression
C
description
D
instruction
The World Health Organization gave a warning to the public without any ____when the virus of H1N1 hit Mexico in April, 2009.
#7096
A
delay
B
effort
C
schedule
D
consideration Ks
The officer insisted that Michael did not follow the correct ________ in applying for a visa.
#5917
A
pattern
B
procedure
C
program
D
perspective