In hot summer, milk quickly turns sour it is refrigerated.

In hot summer, milk quickly turns sour       it is refrigerated.

#31564

while

until

unless

推荐题目

Study hard , ______ you will not pass the exam .

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and

otherwise

unless

— Is it OK if I take this seat?—Sorry,___________.

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here you are

take it

it is taken

never mind

.A computer is so useful a machine ________ we can use everywhere.

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that

which

what

. Do what you think is right, ______ you will gain a surprising happy ending.

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and

but

before

Try _____ she might, Sue couldn’t get the door open.

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when

since

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