7.Although the causes of cancer ____， we do not yet have any practical way to prevent it.
#105343
A
are being uncovered
B
have been uncovering
C
are uncovering
D
have uncovered
推荐题目
______, your composition is full of mistakes.
#105329
A
Writing carelessly
B
Written carelessly
C
Having written carelessly
D
Being written carelessly
Since 1 won the big prize，my telephone hasn’t stopped ringing. People____to ask how I am going to spend the money.
#105338
A
phone
B
will phone
C
were phoning
D
are phoning
With more forests being destroyed, huge quantities of good earth ______ each year.
#105331
A
is washing away
B
is being washed away
C
are washing away
D
are being washed away
6.I have to go to work by taxi because my car ____at the garage.
#105344
A
will be repaired
B
is repaired
C
is being repaired
D
has been repaired
“The moment ________ soon”，he thought to himself，waiting nervously.(2012·湖南)
#105316
A
came
B
has come
C
was coming
D
is coming