Brian's eyes felt tired because he ...... on his laptop ...

[ Grammar ]

Brian’s eyes felt tired because he …… on his laptop for hours.

A. has chatted

B. had chatted

C. had been chattering

D. has been chattering

Select your answer:

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Which modal verb is used to express necessity or obligation?

A. must

B. can

C. should

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English is … than Chinese.

A. more easy

B. easier

C. eassier