The robot manufacturer had his customers ___ their outdated robots. ...

[ Grammar ]

The robot manufacturer had his customers ___ their outdated robots.

A. exchange

B. exchanged

C. to exchange

D. exchanging

Select your answer:

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Tenses & Preposition Verbs � Nouns � Adjectives - Adverbs Adjectives, ING - ED Lexico and Grammar Verbal Phrases How many / How much - Is there / Are there Have to / Do not have to Stative Verbs and Tenses Adverbs of frequency

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Grammar › View

I (not/understand) ____ that man because I (not/know)____ English.
A. don’t understand, don’t know
B. don’t understand, not know
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D. am not understand, am not know

Adjective › View

a.angry
b.fast
c.cool
d.dangerous