________, it began to rain unexpectedly.
#68281
A
While cleaning the machine
B
To clean the machine
C
He was cleaning the machine
D
While he was cleaning the machine
推荐题目
House prices vary from place to place and are usually high _____ there are famous schools.
#67857
A
where
B
since
C
when
D
whether
．The pretty young woman is now experiencing a whole new world that is incredibly awkward _________ there is true love, happiness and care.
#72379
A
when
B
where
C
how
D
that
______ is often the case, many Chinese parents save enough money for their children’s further education.
#70026
A
Which
B
That
C
As
D
Where