Only when __________________ permission _______________ allowed to enter the lab.
#4817
A
a teacher has given; are the students
B
has a teacher given; are the students.
C
has a teacher given; the students are
D
a teacher has given; the students are
推荐题目
Evidence obtained from observation and experiment is often used to _____ a scientific theory.
#4841
A
confirm
B
confine
C
conform
D
conceive
Of one thing I am certain _____ hard work contributes to good results.
#59048
A
as
B
what
C
which
D
that
You don’t want your parents to critisize you_______ you stop wearing long hair at school.
#4578
A
unless
B
if
C
though
D
so that
Since Shanghai won the right to host the World Expo, over half a million people have volunteered to ___________in all the Shanghai Expo projects .
#4701
A
assist
B
apply
C
supply
D
provide