your hand over your mouth when you coughA.PutB.PuttingC.To putD.To be putting
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______ your hand over your mouth when you cough
A.Put
B.Putting
C.To put
D.To be putting
试题答案
A
“咳嗽时用手捂住嘴。”因为已经有连词when，所以用祈使句。答案A。