中科新闻网拉缸盐海参怎么发:各位大侠举手之劳,帮帮我!!我定报恩!!
来源：百度文库 编辑：中科新闻网 时间：2024/05/14 18:56:36
While he ____ his homework,his mom ____in the kitchen.
A.was doing, was cooking
B.did, cooked
C.was doing, cooked
D.did, was cooking
A.was doing, was cooking
B.did, cooked
C.was doing, cooked
D.did, was cooking
C~~~~~~~~~ 8
C
while后加过去进行时，后半句就要用过去时
C