The number of registered participants in this year's marathon was twice ______.
A、
of last year's
B、
those of last year's
C、
of those of last year
D、
that of last year's
【正确答案】
D
【答案解析】
that指代上文中的the number。句意：今年马拉松的报名参赛人数是去年的一倍。
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