24. It was fantastic to fly. _____. Such an experience was unforgettable.
(A) While flying low, the windmills were seen
(B) When we are flying low, the windmills were seen
(C) When flying low, we saw the windmills
(D) We saw the windmills flying low

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統計: A(6), B(3), C(23), D(0), E(0) #2290392