We can _____(save) water by _____(not brush) our teeth under a running tap.
问题描述:
We can _____(save) water by _____(not brush) our teeth under a running tap.
答
save not brushing
答
save... not brushing
答
We can save water by not brushing our teeth under a running tap.
by 是介词,后面要跟动名词.