单项选择题

The achievements of the greatest minds in science could never have been reached if it had not been for the patient and accurate work of hundreds of other people（）.

A．has it not been
B．if it had been
C．if hasn't been
D．had it not been

相关考题

No thing fuels cynicism for watching two titanic instit...

单项选择题No thing fuels cynicism for watching two titanic institutions squabble over their reputations（）.

A．No... as
B．Something... like
C．Nothing... like
D．No... than

The general manager demanded the job will be completed ...

单项选择题The general manager demanded the job will be completed before the National Day（）.

A．would be completed
B．must be completed
C．had to be completed
D．be completed

No such weapons were used and none been found（）. A．none...

单项选择题No such weapons were used and none been found（）.

A．none have been
B．none has
C．no other has been
D．no others been