"Do I understand that it is not compulsory for us to attend?" Mr. Johnson asked.

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问题 "Do I understand that it is not compulsory for us to attend?" Mr. Johnson asked.

选项 A、advisable
B、obligatory
C、indiscreet
D、necessary

答案B

解析 B项obligatory“必须的,义不容辞的”,与compulsory在很多义项上都很接近。A项advisable“可取的,明智的”;C项indiscreet“不慎重的,轻率的”;D项necessary“必要的”。
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