Ms．Arroya says that when workshop__________begins to slow down，it may -考呗网题库移动版

单选题Ms．Arroya says that when workshop__________begins to slow down，it may be time to hire more workers．

A．product
B．producer
C．produce
D．productivity

参考答案D

解析:【答案】D。解析：在“when”引导的状语从句中，主语要表示“工厂生产力”时，才能和动词“slow down”搭配使用，因此D为正确答案。

单选题An investigation by the committee uncovered__________instances in which the institution's resources had been misused.

A．none
B．any
C．no
D．much

单选题 Ms. Hartfield will make an excellent executive because, when confronted with a problem,she knows __________ what course of action to take.

A．hastily
B．urgently
C．abruptly
D．instantly

单选题 The advertisement for the security guard position says that applicants must be able to re-main __________ for six hours straight.

A．alert
B．observable
C．discovered
D．obvious