問題詳情：
People more and more useful things to protect the earth since Earth Day was started.
A. did B. were doing C. will do D. have done
【回答】
D
知識點：動詞時態
題型：選擇題
![Toprotecttheenvironment,supermarketsdon't freeplas...]( "Toprotecttheenvironment,supermarketsdon't freeplas...")
Toprotecttheenvironment,supermarketsdon't freeplas...![Toprotecttheenvironment,supermarketsdon't freeplas...]( "Toprotecttheenvironment,supermarketsdon't freeplas...")
Toprotecttheenvironment,supermarketsdon't freeplas...![Toprotecttheenvironment,supermarketsdon't freeplas...]( "Toprotecttheenvironment,supermarketsdon't freeplas...")
Toprotecttheenvironment,supermarketsdon't freeplas...![Toprotecttheenvironment,supermarketsdon't freeplas...]( "Toprotecttheenvironment,supermarketsdon't freeplas...")
Toprotecttheenvironment,supermarketsdon't freeplas...![Toprotecttheenvironment,supermarketsdon't freeplas...]( "Toprotecttheenvironment,supermarketsdon't freeplas...")
Toprotecttheenvironment,supermarketsdon't freeplas...![Atonetime,computerswereexpectedlargelytoremovethenee...]( "Atonetime,computerswereexpectedlargelytoremovethenee...")
Atonetime,computerswereexpectedlargelytoremovethenee...![Atonetime,computerswereexpectedlargelytoremovetheneedf...]( "Atonetime,computerswereexpectedlargelytoremovetheneedf...")
Atonetime,computerswereexpectedlargelytoremovetheneedf...![—Pleasedon’tforgettoclosethedoorwhenyouleavetheroom. ...]( "—Pleasedon’tforgettoclosethedoorwhenyouleavetheroom. ...")
—Pleasedon’tforgettoclosethedoorwhenyouleavetheroom. ...
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