The argument remains extremely heated there are necessary conditions of existence such as water on the Mars.
#71649
A
that
B
whether
C
if
D
which
推荐题目
Our teacher is always busy preparing lessons until 11 o’clock at night, _____we students have gone to sleep.
#72213
A
that time
B
by which time
C
by that time
D
which time
The engineer ______my father works is about 50 years old.
#73792
A
to whom
B
on whom
C
with which
D
with whom
The professor said he could talk on _____ interested the audience.
#72060
A
any topic
B
which topic
C
whichever topic
D
the topic he thought it