单项选择题

A．Has never been to his friend’’s house.
B．Has been to his friend’’s house before.
C．Used to go to his friend’’s house a lot.
D．Often goes to his friend’’s house.
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单项选择题
A．Sewage and industrial waste.B．Oil pollution on the beach.C．Oil discharged at sea when people cleaning oil tanks.D．The oil that leaks out after ship collisions.
A．Sewage and industrial waste.
B．Oil pollution on the beach.
C．Oil discharged at sea when people cleaning oil tanks.
D．The oil that leaks out after ship collisions.
单项选择题
A．Childhood in his native home, Texas.B．Working as congressional secretary in Washington.C．Vacationing at his ranch in Texas.D．Presidency in the White House.
A．Childhood in his native home, Texas.
B．Working as congressional secretary in Washington.
C．Vacationing at his ranch in Texas.
D．Presidency in the White House.
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