Q6
The director of the conservatory emphasized to the new students that to become successful musicians not only talent but also hard work were necessary.

a)...
b) in order to be successful musicians requires hard work as well as talent
c) becoming a successful musician requires hard work as well as talent
d) not only talent but also hard work was necessary to become a successful musician
e) both hard work and talent were necessary for them becoming successful musicians.

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The given answer is C.
My question is that if in option D the verb "was" is replaced by "is" , will it serve as an answer.