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【简答题】
v. bring or call together into a group
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反馈参考答案：
举一反三
【简答题】字符串中提供了一系列的方法帮助我们更好的使用字符串,请举例
【单选题】John said that he ______ London twice.
A.
have been to
B.
have gone to
C.
had gone to
D.
had been to
【单选题】对正弦求三阶导数的表达式是:
A.
N[Sin[x], {x, 3}
B.
D[Sin[x], {x, 3}
C.
D[sin[x], {x, 3}
D.
N[sin[x], {x, 3}
【简答题】按照生产安全事故等级划分,将安全生产事故分为四个等级,分别是( )、( )、( )、( )。
【单选题】— Where's your father? — He ______ Shanghai. He'll be back next week. [ ]
A.
has gone to
B.
have gone to
C.
has been to
D.
have been to
【单选题】He is not in the office. He must have gone to have classes, ______ ?
A.
didn't he
B.
doesn't he
C.
mustn't he
D.
hasn't he
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