He gave us warning to stay away from the machine ...

[ Tenses ]

He gave us warning to stay away from the machine while it __________.

A. had worked

B. was working

C. would work

D. would be working

Select your answer:

Random Topics:
Present, Past, and Future Time Adjectives & Quantifiers First & Second Conditional Simple Present Tense Grammar: Defining Relative Clauses Present Simple vs Present Continuous Dependent Clauses Verb Tense, Pronouns and Antecedents Simple Past - Irregular Verbs

Other quiz:

Degrees of Comparison › View

I’m sorry, but that’s ____ expensive that I thought.
A. more
B. most
C. the more
D. the most
E. more than

Grammar › View

When she was in the outfield, Lilly ____ the ball as hard as she could so that it would get back to the infield.

A. through

B. threw