题文
Please be quiet!The students______ an exam．（ ）
| A． |
take |
B． |
are taking |
| C． |
took |
D． |
were taking |
Please be quiet!The students______ an exam．（ ）
| A． |
take |
B． |
are taking |
| C． |
took |
D． |
were taking |
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