Storing our clients' files electronically will result in a more_____

单选题 Storing our clients' files electronically will result in a more__________use of our office space.

A．efficiencies
B．efficiently
C．efficiency
D．efficient

参考答案D

解析:【答案】D。解析：句意为“把客户资料保存为电子文件会更加高效地使用我们的办公空间。”空格后面是名词，因此需要填人形容词，只有D项符合，“efficient”意为“有效率的，高效的”。

单选题 December sales were __________low, and sales staff are encouraged to submit suggestions on how to address the problem.

A．disappointing
B．disappoint
C．disappointed
D．disappointingly

单选题 Ms.Chen thought that her idea for a new washing machine could be a profitable__________.

A．invents
B．invent
C．inventor
D．invention

单选题As __________in the rental agreement, the apartment maintenance staff will respond to all service requests within 48 hours.

A．note
B．notes
C．noted
D．noting