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

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

Over the past five years we ___(do)nothing,so we must _____(do)something that we can____(do) now.
have done Over/in/during the past five years 是现在完成时的标志
do
do

did,do,do

did do do