問題詳情

21. One species of Australian frog lays up to 25 eggs at a time and _____ for protection.
(A)swallows they
(B) swallow they
(C) swallow them
(D) swallows them

參考答案

答案：D
難度：簡單0.75
統計：A(0),B(0),C(1),D(3),E(0)