根据语法，此处应填入一名词作“happens”的主语。候选项中的名词有B)、F)、H)、K)和M)，再依据该主-找考题网

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【参考答案】

F

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填空题B

单项选择题A．Many foreign tourists visit the United States every year.B．Americans enjoy eating out with their friends.C．The United States is a country of immigrants.D．Americans prefer foreign foods to their own food.

A．Many foreign tourists visit the United States every year.
B．Americans enjoy eating out with their friends.
C．The United States is a country of immigrants.
D．Americans prefer foreign foods to their own food.