____some doubt among scientists about the cause of cancer.
#92930
A
It exists
B
There exists
C
There is existing
D
It is existing
推荐题目
He moved away from his parents and missed them ________enjoy the exciting life in China.
#94969
A
too much to
B
very much to
C
enough to
D
much so as to
Hardly ________________ she heard the strange scream coming from behind a tree.
#92073
A
had she walked out of the woods than
B
did she walk out of the woods when
C
had she walked out of the woods when
D
she had walked out of the woods when
_________ is no possibility _________ China wins FIFA World Cup.
#91860
A
There; that
B
It; that
C
There; whether
D
It; whether