Измените глагол в предложениях в зависимости от обстоятельств: His sister (develop) new alloys at the research laboratory 1. all the morning today; 2. fi...

Измените глагол в предложениях в зависимости от обстоятельств: His sister (develop) new alloys at the research laboratory 1. all the morning today; 2. five years ago; 3. every year; 4. for several hours next week; 5. before we came to help her yesterday.
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1/ has been developing 2/ developed 3/ develops 4/ will have been developing 5/ had develped
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