The direction which the president would go was kept a secret safety concern.
A. for, over
B. from, about
C. in, for
D. at, as
网友回答
A. for, over
B. from, about
(答案→)C. in, for
D. at, as
解析：考查介词的用法。第一空构成定语从句，介词+关系代词，其先行词是“the direction”所以要用介词“in”;第二空应填“for”,表“为了”，for safety concern“为了安全起见”。句意：总统的去向为了保险起见是保密的。选C。