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【判断题】
、导套常采用正火的方式来提高耐磨性。A.
正确
B.
错误
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【单选题】My father _________ Beijing many times. He _________ there again last week.
A.
has been to; has gone
B.
has gone to; went
C.
has been in; has gone
D.
has been to; went
【单选题】My father _____ to America. He _____ there three months ago. [ ]
A.
went; has been
B.
has been; has gone
C.
has gone; went
D.
has went; went
【单选题】My father _________to South Hill．He______ there for 5 days．
A.
has gone：has been
B.
has been; has gone
C.
has gone；has gone
D.
has been；has been
【单选题】抽样调查法，是指从研究对象的全部单位中抽取一部分进行考察和分析，并用这部分的数量特征去推断总体的数量特征的一种调查方法，有随机抽样和非随机抽样两种。下列属于非随机抽样形式的是（）。
A.
等距抽样
B.
整群抽样
C.
判断抽样
D.
分层抽样
【单选题】My father______ Australia for a year. And he enjoys staying there.
A.
has been in
B.
has been to
C.
has gone to
D.
went to
【单选题】My dad __________ Singapore for a meeting. He ________ there twice.
A.
has gone to, has been to
B.
has been to, has gone to
C.
has gone to, has been
D.
has been to, has gone
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