问题
选择题
Soon they ____________ the water which ____________ the pipe.
A．ran out; ran out of
B．ran out of; ran out of
C．ran out; ran out
D．ran out of; ran out
答案
答案：B
本题考查动词短语。run out (of)用完，耗尽。run out 为不及物动词短语，run out of 为及物动词短语。这里两空都有名词，故都用ran out of。