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The number of registered participants in this year's marathon was half _________.

A．that of last year's                                         B．those of last year's

C．those of last year.                                       D．of last year's

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

The number of registered participants in this year’s marathon was half　 .

A.that of last year’s 　　　　　　　　　　　　 B.those of last year’s

C.those of last year　　　　　　　　　　　　　 D.of last year’s

The number of registered participants in this year’d marathon was half        ．

    A．of last year’s                            B．those of last year’s

    C．that of last year’s                      D．of those of last year