Professor Smith,along with his assistants,       on the project day and night to meet the deadline.
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A
work      
B
working
C
is working
D
are working
推荐题目
There are five _______on the table.
#44149
A
apples
B
water
C
egg
D
boxs
To get well,     .
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A
we are going to operate on the patient
B
an operation is necessary
C
the patient needs an operation
D
the doctor will perform an operation on the patient