15. After the storm last night, many ships sank to the bottom of the ocean. The only left ship is
_______________ the waves and the winds. There is nothing we can do about it.
(A) at the mercy of
(B) by dint of
(C) by way of
(D) in the case of
II. 句子挑錯:第 16 - 25 題，每題均有一個劃底線的選項，分別用
(A)、
(B)、
(C)、
(D)
加以標示，其中有一個是錯誤的，請選出錯誤的選項。

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