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the road is covered with snow.i can"t understand ()they insist on going by motorbike.这里面i can"t understand是先行词吗?所以要填定语吗?还是因为是同位语,所以要填定语呢?

题目详情
the road is covered with snow.i can't understand ()they insist on going by motorbike.
这里面i can't understand是先行词吗?所以要填定语吗?还是因为是同位语,所以要填定语呢?
▼优质解答
答案和解析
需要加定语why.这是个定语从句.