Select your answer:
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Modals › ViewUsing lasers to produce extremely short and repeatable pulses of light, today scientists ———— events happening in time intervals as short as l.000 trillionth of a second.
A. must have measured
B. were measuring
C. used to measure
D. may have measured
E. are able to measure
Verbs and Adverbs › View
Our music teacher ______ lost in thoughts.
A. cleanly
B. generally
C. fast
D. much