问题

It has been announced that students shall remain in their seats until all the papers ________.[ ]

A: will be collected
B: were collected
C: have been collected
D: have collected

正确答案是：

同类题型

Lessons can be learned to face the future, ________ history cannot be changed.

.The surroundings of his house______ clean now.

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ildren believe they can succeed, they will neverbecome totally independent

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