問題詳情
16. Each year, millions of butterflies ___ the highway. Unfortunately, many of them are killed by the trafficwhen ___ the highway.
(A) fly cross； they across
(B) fly across； crossing
(C) across； they cross
(D) fly across； fly across
參考答案
答案：B
難度：計算中-1
書單：沒有書單，新增
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