C.time-consuming　D.timely-consuming
【解析】答案C。“除了照看孩子们之外，她还要承担如此繁重的诸如提水打柴的家务活”，“time-consuming”意为“耗时间的，需要花费时间、精力等的”，名词+加动名词结构。
[例3]John often attends public lectures at the University of Oxford，chiefly______his English.
A.to improve　B.to have improved
C.improving　D.improved
【解析】答案C。现在分词作目的状语，故用improving。
[例4]______for many years，the writer suddenly became famous.
A.Having ignored him　B.To be ignored
C.To have been ignored　D.Having been ignored
【解析】答案D。“被忽视了这么多年，这位作家突然就变得有名气了”。