Small sailboats can easily turn over in the water ________.
#82117
A
if not managed carefully
B
if are not managed carefully
C
unless not managed carefully
D
unless are not managed carefully
推荐题目
It was announced that only when the fire was under control __________to return to their homes.
#82224
A
the residents would be permitted
B
had the residents been permitted
C
would the residents be permitted
D
the residents had been permitted
Upon into the blue sky ______ when we passed by its nest.
#80132
A
did the bird fly
B
flew the bird
C
the bird flew
D
had the bird flown
The pressure of this gas pipe is greater than__________.
#84351
A
the gas pipe
B
of the gas pipe
C
that of the gas pipe
D
those of the gas pipe
Little_____ about her own safety, though she was in great danger herself.
#84631
A
did Rose care
B
Rose did care
C
Rose does care
D
does Rose care
When _______a hand, one should say “Thank you” or “It’s very kind of you.”
#81001
A
offered
B
to offer
C
to be offered
D
offering