[ Present Perfect Tense and Simple Past Tense ]
Ken __________ already __________ his friends to his birthday party. He is very excited now.
A. has invite
B. has inviting
C. has invited
D. have invited

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a, an, the, Zero Article › View_________ cell phones do not cause cancer.
A. No article
B. A
C. An
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Present Tenses › View
Don’t wash up that cup. I _____ my coffee yet.
A. don’t finish
B. aren’t finishing
C. haven’t finished
D. haven’t been finishing
