填空题

The police were warned to be more careful when making their (investigate) ______.

【参考答案】

investigation
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单项选择题
A．Doctor and husband.B．Shop assistant and customer.C．Librarian and student.D．Boss and secretary.
A．Doctor and husband.
B．Shop assistant and customer.
C．Librarian and student.
D．Boss and secretary.
填空题
This problem needs (discuss) ______ further.
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