16. It’s not easy to see those islands clearly from here on sunny days, and it’s even less_________to see them on cloudy days.
(A) difficult
(B) lucky
(C) possible
(D)special
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統計: A(89), B(65), C(332), D(20), E(0) #3104696
統計: A(89), B(65), C(332), D(20), E(0) #3104696