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The machine is difficult to build ...... easy to maintain.

  • A.But
  • B.And
  • C.For
  • D.It

Answer: A

Correct answer: But

The two halves contradict each other - hard to build, easy to maintain - and but is the connective for a contrast.

And would join them as though they agreed, for would make one the reason for the other, and it is not a conjunction.

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