Question

What do you imagine _____ him from going?? A．to prevent B．preventing? C．to have prevented

Answer 1

答案是：b　句子的意思是：　树木有助于阻止沙尘暴
有助于做某事词组是：
help
(to
)
do
sth

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Answer 2

D
do
you
think
(believe,
guess,
etc)也是插入成分，但其后接的句子用陈述句语序
what
prevented
him
from
going.