If you have trouble with math, you can do massive exercise ______you feel comfortable with it.

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问题 If you have trouble with math, you can do massive exercise ______you feel comfortable with it.

选项 A、until
B、if
C、while
D、unless

答案A

解析句意：如果你在学习数学时感到困难，那么你可以做大量的练习直到你能够轻松应对。until意为“直到……(为止)”；if意为“如果”；while意为“当……时，然而”；unless意为“除非”。可知，正确答案为A。

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