[ Grammar ]
The theory was too __________ for most students.
A. abstruse
B. psychological
C. conventional
Select your answer:

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Grammar › ViewDo you know anyone _______ could help me improve my maths skills?
A. that
B. who
C. when
Tenses › View
Shadow puppets____ in China many years ago and since then, ____ all over the world.
A. originate / have been spreading
B. originate / had spread
C. are originating / have spread
D. originated / have spread
