How can he do so much work? He ________ stay late at the off

【名词&注释】

形容词(adjective)、办公室(office)、无约束(unconstrained)、不符合(inconformity)、中枢化学感受器(central chemoreceptor)、带回家、氧分压降低(oxygen partial pressure)

[单选题]How can he do so much work? He ________ stay late at the office every evening and take work home at weekends．

A. need
B. can
C. might
D. must

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学习资料：

[单选题]My daughter tells me that it is fashionable to wear jeans that are very ________around the waist．

A. loose
B. lose
C. free
D. restrict

[单选题]It isn’t quite ________ that their team will win the game this evening．

A. exact
B. right
C. sure
D. certain

[单选题]血中氧分压降低^{(oxygen partial pressure)}导致呼吸加强的原因是直接兴奋（　　）

A. 延髓呼吸中枢
B. 呼吸调整中枢
C. 外周化学感受器
D. 中枢化学感受器
E. 肺牵张感受器

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