—____when has the country been open to international trade?

—____when has the country been open to international trade?—1978,I suppose.

#79800

Since

From

After

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All the novels in the list, 　　　otherwise stated, are all available in this library.

#30578

although

unless

I was about to go out ________ it began to rain.

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when　　　

since　　　

while

_____ you make a plan for study, you have to follow it.

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Even

Once

Unless

Until

“He hasn't got any hobbies——_______you call playing games on computer a hobby.” Mr. Lin said.

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Unless

When

Since

Alice, you’d better put the vase away ________ it gets broken.

#31323

when

before

unless

while