[ Present Tenses ]
. Which of the following sentences is in the present perfect continuous tense?
A. We studied last night.
B. They study every day.
C. She has been studying for hours.
D. He will study tomorrow.

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Mixed General Quiz › ViewHiking trails in the mountains are popular with ___.
a. hiking
b. hiked
c. hikers
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When Marie Curie discovered radium, the elements’ properties and potential were not fully understood.
A. NO CHANGE
B. the elements property’s and potential
C. the element’s properties and potential’s
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Tenses › ViewThey ____ their friends every day.
A. meet
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If he more free time, he would take his children to the zoo.
A. has
B. is having
C. had had
D. had
