We were told not to touch the equipment in the laboratory unless ________.
#101834
A
allowed to do
B
allowing to do
C
allowed to
D
allowing to
推荐题目
–You speak very good Chinese. --Thanks. I _______ it for 4 years before I came to China.
#103358
A
studied
B
study
C
was studying
D
had studied
Cathy is taking notes of the grammatical rules in class at Sunshine School， where she English now.
#104609
A
studies
B
studied
C
is studying
D
was studying
The driver could have survived but he the seat belt.
#102832
A
had been wearing
B
hadn't worn
C
wasn’t wearing
D
didn't wear
In the past decades, sea ice _____in the Arctic as a result of global warming.
#102142
A
had melted
B
has been melting
C
melted
D
is melting
—Have you read the book called Waiting for Anya?—Who _________ it?
#104597
A
writes
B
has written
C
wrote
D
had written