来自马游春的问题
【选择填空Tokeepthehealthy,onegoodwayistokeepwindows-soastokeeptTokeepthehealthy,onegoodwayistokeepwindows_soastokeeptheindoorairfresh.A.openedB.openC.openingD.toopen请说明为什么选填A或B或C或D,】
选择填空Tokeepthehealthy,onegoodwayistokeepwindows-soastokeept
Tokeepthehealthy,onegoodwayistokeepwindows_soastokeeptheindoorairfresh.
A.openedB.openC.openingD.toopen
请说明为什么选填A或B或C或D,
