Question

The mould ___(kill) some germs he tried to grow in his laboratory.
Insert correct form of word in bracket.
Plzzz help.​

Answer 1

Answer:

had killed

Step-by-step explanation:

Had killed is used to connect a link between past and present.

Since in the question , it is mentioned "tried to grow" then the answer must be had killed .

So the sentence will be :

The mould had killed (kill) some germs he tried to grow in his laboratory.