Over the past five years we ___(do)nothing,so we must _____(do)something that we can____(do) now.

问题描述:

Over the past five years we ___(do)nothing,so we must _____(do)something that we can____(do) now.

did do do

did,do,do

have done Over/in/during the past five years 是现在完成时的标志
do
do