It is very dangerous to swim in the river.What can stop them _ doing that?Afrom B to C out ofD in

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It is very dangerous to swim in the river.What can stop them _ doing that?Afrom B to C out ofD in
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It is very dangerous to swim in the river.What can stop them _ doing that?Afrom B to C out ofD in
It is very dangerous to swim in the river.What can stop them _ doing that?Afrom B to C out ofD in

It is very dangerous to swim in the river.What can stop them _ doing that?Afrom B to C out ofD in
选A.
stop from是"阻止"的意思.from是介词,根据"介词后接名词或动名词"的原则,后面的do用-ing的形式.