Question

Gopichand, who was coaching/has been coaching/is coaching) national
level badminton players for 20 years, (is surprised/has been surprised/
was surprised) when Saina Nehwal _ became/has become/becomes) the
first Indian to win two singles gold medals in Commonweath Games.​

Answer 1

Answer:

1. has been coaching
2. was surprised

3. became

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Answer 2

Gopichand, who has been coaching national  level badminton players for 20 years, was surprised when Saina Nehwal  became the  first Indian to win two singles gold medals in Common wealth Games.​

Explanation:

In the English language it is important to use a correct grammar and tense in order to frame a correct sentence .

Hence , from the question ,

The correct statement is as follows -

Gopichand, who has been coaching national  level badminton players for 20 years, was surprised when Saina Nehwal  became the  first Indian to win two singles gold medals in Common wealth Games.​

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