What would you do if you injured your knee while__?A.run B.runs C.ran D.running 求详解

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Whatwouldyoudoifyouinjuredyourkneewhile__?A.runB.runsC.ranD.running求详解Whatwouldyoudoifyouinjuredyour

What would you do if you injured your knee while__?A.run B.runs C.ran D.running 求详解
What would you do if you injured your knee while__?A.run B.runs C.ran D.running 求详解

What would you do if you injured your knee while__?A.run B.runs C.ran D.running 求详解
D.while后面一般加动词现在分词形式.

D.running

D

d,while 表示是个时间点