I think you must be mistaken about seeing him at the theatre; I’m sure he ______ abroad all week.
#105011
A
is
B
was
C
has been
D
had been
推荐题目
 —Have you graduated from college?—Yes, ________.
#99968
A
I studied French for two years.
B
I have been studying French.
C
I have studied French for two years.
D
I had studied French for two years.
The water will be polluted unless some measures _____.
#103340
A
will be taken
B
are being taken
C
are taken
D
were taken