【单选题】When _______such a question, he kept silent.
【单选题】When ______ if he had any idea of what the novel was about, Jack just kept silent.
【单选题】He ________ the naughty children and they kept silent at once. [ ]
【单选题】When ______ how old he was, he kept silent.
【单选题】When _________ where he had put the book, he kept silent.
【简答题】油常见的伪品有哪些?写出其真伪鉴别方法。
【简答题】He kept silent over the matter because he had no intention to risk ______ in it. [ ] A . to involve B. being involved C . to be involved D. involving
【简答题】图像按照空间坐标的连续性可分为()和()
【单选题】In the lecture, little Tom kept silent all the time unless _________ to express his opinion.
【单选题】When if he hadany idea what the novel was about, Jack kept silent. He have read it very carefully.