[ Grammar ]
choose the grammar structure of present perfect
A. subject , have +simple past verb
B. subject+have-has verb+past participle verb
C. subject+past participle verb +have has
D. subject + has +past participle ver
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A. would study
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Tenses › View
When do we use simple present tense?
A. When an action has happened.
B. When an action is happening right now.
C. When an action may happen in the future.