[ Opinion / Agreement ]
There are some opinions about Covid-19, except …
A. It changes the education system
B. It is a problem in economy
C. It is very risky for the health
D. It spreads slowly

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A. Help
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When we were in elementary school, we ……… (not/learn) past perfect tense before we got English course.
A. have learnt
B. had not learnt
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