Tests are meant to measure the learner's knowledge of the language, not to provide information upon which to build up a picture of the language learner's 'interlanguage' at any particular moment. The information we get from tests may help us to do this, but this is not what they are designed for. For example, as we have seen, it is a feature of objective test questions that they have one and only one correct answer. They are not 'open-ended'. We force the testee to choose one of our responses, not to produce spontaneously what his own form of the target pornproslanguage (his interlanguage) would suggest was right. It is not uncommon for a testee to wish to reject all the responses offered in a test question – even the correct one – because none of them are generated by the grammar of his interlanguage.
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