One hundred potential vaccines are___ being tested on human volunteers to cure an incurable disease in the future.

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问题 One hundred potential vaccines are___ being tested on human volunteers to cure an incurable disease in the future.

选项 A、commonly
B、currently
C、accidentally
D、suspiciously

答案B

解析因为句中使用的是现在进行时are being tested，所以应当选择相应的副词currently。

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