这个句子为什么要用不定式the test potential is to be increased to the test voltage不能说成The test potential increased to test voltage吗?

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这个句子为什么要用不定式the test potential is to be increased to the test voltage不能说成The test potential increased to test voltage吗?
这个句子为什么要用不定式
the test potential is to be increased to the test voltage不能说成The test potential increased to test voltage吗?

这个句子为什么要用不定式the test potential is to be increased to the test voltage不能说成The test potential increased to test voltage吗?
is to be 是表示将来的,而The test potential increased to test voltage 直接就是过去时了,与意思不符合

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