[ Vocabulary ]
The………………of the environmental protection program has forced people to reflect on every item they discard.
A. issue
B. disposal
C. emission
D. institution
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Passive Voice › ViewThey suggest that you …………………working hard to achieve your goal.
A. keeping
B. should keep
Present Perfect Continuous Tense › View
He …….this science for 3 years. (study)
A. have been studying
B. has been studying
C. has studied
D. is studying