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Here, ‘have been’ should be used instead of ‘had’. The present perfect tense should be used to indicate an action that began in the past and has lasted into the present time.
The sunglasses had a moment a few years ago, but the classic shades have been around for years.
Pebrine is a disease of B. mori:
Heavy infestation of which of the following causes poor ploughing performance?
When to irrigate wheat after sowing if only one irrigation water is available:
Which scheme aims to promote the use of bio-pesticides and bio-agents for pest control?
Which disease of wheat is known as cancer of wheat?
What type of herbicides are designed to control or kill a wide range of weed species?
Identify the wrong sequence
When an allele of one gene hides or masks the visible output, or phenotype, of another gene it is known as:
Panama wilt is a disease of which crop?
An acute or chronic inflammation of the mammary gland caused by physical, chemical and biological agents chiefly of bovines usually affecting the secret...
