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Grammar › View

The ship always ___ arrive on schedule.

A. arrive

B. have arrived

C. arrives

D. are arriving

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Modals › View

Using 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

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