问题
选择题
—Guess what？I came first in that contest. —Great！You ________ a lot during the past two weeks.
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答案
D
在比赛中得了第一名一定是经过很多练习换来的，所以D项must have practised符合语意，表示对过去情况的肯定推测。 答案 D
搜题请搜索小程序“爱下问搜题”
—Guess what？I came first in that contest. —Great！You ________ a lot during the past two weeks.
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＝125MPa，最低温时导线比载g＝34.047×10－3N／m•mm2，试求最低温时两悬点应力。