倒装、强调与省略 — 英语选择题
题目
下列句子中，省略现象与另三项不同的是：A. If (it is) necessary, call me at once. B. When (he was) asked about the result, he remained silent. C. Though (he was) exhausted, he kept on running. D. The experiment, (which was) conducted carefully, yielded reliable data.