单项选择题

Not until 1942______a drying patient’s life using penicillin．

A．when John Bumstead and Orvan Hess saved
B．saved John Bumstead and Orvan Hess
C．did John Bumstead and Orvan Hess save
D．that John Bumstead and Orvan Hess

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热门试题

单项选择题

When I was a teenager，I______a lot and people couldn’t understand what I was saying．

A．complained
B．mumbled
C．uttered
D．gossiped

单项选择题

As a scientific document ， the book should stand for several years until furtger______make revision______．

A．development；impossible
B．experiments； optional
C．advances；necessary
D．attempts；undesirable