【題組】61.Dring their migrating flight, red knot wading birds can save energy by flying______

問題詳情

【題組】61.Dring their migrating flight, red knot wading birds can save energy by flying_______.
(A)separately
(B)alone
(C)in groups
(D)in pairs

答案：D
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)