题目内容：
17. When the pilot saw the target, he immediately _______ the headquarters.
(A) radioed
(B) radioed to
(C) informed of
(D) announced
参考答案：
选择题：17.When the pilot saw the target, he immediately _
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When the pilot saw the target, he immediately _______ the headquarters.
(A) radioed
(B) radioed to
(C) informed of
(D) announced