填空题

The virus of flu is well adapted to immune systems of water birds, and does not usually make them very sick.

【参考答案】

Y
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表明你写这封信的目的。 2．选择这份工作的原因。
单项选择题
A．be taking placeB．take placeC．be taken placeD．have taken place
A．be taking place
B．take place
C．be taken place
D．have taken place
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