[ Present Perfect ]
How long ____________ the children slept?
A. did
B. have
C. has
D. do

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Prepositions › ViewWe were very grateful ______ our friends for all of their assistance.
A. for
B. to
C. about
D. from
Grammar › View
Call your doctor _____ booking an appointment.
A. so that
B. in order to
C. for
Grammar › ViewMy sister really enjoys acting as a hobby, but she doesn’t want to do it for a(n) _______
A. occupation
B. existence
C. living
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Modals in The Past › View
He ___ stolen the car. He was with me all the time
A. must have
B. should have
C. might have
D. can’t have