He was busy writing a story, only ______ once in a while to smoke a cigarette.
#4946
A
to stop
B
stopping
C
to have stopped
D
having stopped
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Every possible means _______ to prevent the crash , but the computer doesn’t still work．
#4644
A
is used
B
are used
C
has been used
D
have been used
--- Can I help you ? --- I’d like to buy a present for my best friend, _______at proper price but of great use.
#4881
A
that
B
one
C
it
D
this
It is generally believed that teaching is ___________it is a science.
#4916
A
an art much as
B
much an art as
C
as an art much as
D
as much an art as