Professor Smith,along with his assistants,       on the project day and night to meet the deadline.
#86243
A
work      
B
working
C
is working
D
are working
推荐题目
Don’t handle the vase as if it ______ made of steel.
#85800
A
is
B
were
C
has been
D
had been
________ your mother ________ carrots?
#44072
A
Do; eat
B
Is; eat
C
Does; eat
D
Are; eat
They _________ got any brothers or sisters.
#44298
A
hasn’t
B
haven’t
C
don’t
D
doesn’t