单项选择题

When did the assault happen

A．May6
B．May7
C．May16
D．May19
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单项选择题
The United States and Canada have agreed ______ in regard to the Great Lakes.
A．to eliminate swimming entirely
B．to limit boating and
C．to limit phosphates and detergents
D．to kill all algae
单项选择题
A．onB．ofC．toD．for
A．on
B．of
C．to
D．for
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