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