問題詳情
42 Mr. Jones has to be _____ all the time over his rare species of rose grown in the glass house, lest it should bestolen.
(A)allergic
(B)on guard
(C)primitive
(D)in sight
參考答案
答案：B
難度：適中0.612903
統計：A(13),B(114),C(28),D(18),E(0)
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