18.---Why haven't you handed in your experiment report yet?
---I'm sorry.I had no time for it because I _____ my grandfather in hospital all day.( )
0 143175 143183 143189 143193 143199 143201 143205 143211 143213 143219 143225 143229 143231 143235 143241 143243 143249 143253 143255 143259 143261 143265 143267 143269 143270 143271 143273 143274 143275 143277 143279 143283 143285 143289 143291 143295 143301 143303 143309 143313 143315 143319 143325 143331 143333 143339 143343 143345 143351 143355 143361 143369 151629
---I'm sorry.I had no time for it because I _____ my grandfather in hospital all day.( )
A. | took care of | B. | take care of | ||
C. | was taking care of | D. | had taken care of |