单项选择题

German engineers are developing a robot that ______ the behavior and emotions of humans.

(A) imitates
(B) imitated
(C) imitating
(D) to imitate
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单项选择题
The manager of the building materials supply firm is hopeful that the shipment of goods will arrive ______ on time.
(A) exact
(B) exacted
(C) exacting
(D) exactly
单项选择题
If employees are late or miss work without providing prior notice, they must provide a valid ______ to their supervisor.
(A) permit
(B) intensity
(C) perspective
(D) justification
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