問題詳情
26. Nanotech experts say that environmental concerns, at this point, aren’t significant enough____ .
(A) to worry
(B) to be worried
(C) worrying about
(D) to worry about
(A) to worry
(B) to be worried
(C) worrying about
(D) to worry about
參考答案
答案：[無官方正解]
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)
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