The rainbow ____(appear)until the sun came out.

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The rainbow ____(appear)until the sun came out.

The rainbow ____(appear)until the sun came out.
The rainbow ____(appear)until the sun came out.

The rainbow ____(appear)until the sun came out.
didn't appear .此句主要考察not……until 句型.句意为:知道太阳出来彩虹才出现.