单项选择题

Students or teachers can participate in excursions to lovely beaches around the island at regular ()

A．gaps
B．rate
C．length
D．intervals

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单项选择题
The room is in a terrible mess; it ()cleaned.

A．can't have been
B．shouldn't have been
C．mustn't have been
D．wouldn't have been
单项选择题
() that the trade between the two countries reached its highest point.

A．During the 1960's
B．It was in the 1960's
C．That it was in the 1960's
D．It was the 1960's
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