Question

Both of them (done) this​

Answer 1

Answer:

Did is the right answer

Answer 2

Answer:

Past tense:

Both of them had done this.

Both of them did this.

Both of them had been doing this.

Both of them were doing this.

Present tense:

Both of them have done this.

Both of them does this.

Both of them are doing this.

Both of them have been doing this.

Future tense:

Both of them will do this.

Both of them will be doing this.

Both of them will have done this.

Both of them will do this.

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