18. The number of registered participants in this year's marathon was half ____.
(A) of last year's
(B) those of last year's
(C) of those of last year
(D) that of last year’s
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統計: A(126), B(40), C(125), D(199), E(0) #2905542
統計: A(126), B(40), C(125), D(199), E(0) #2905542