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题库 / Prep2007E2-SC-72
Several educational research groups are denouncing the mayor's proposal of a system by which individual teachers would be given raises or bonuses should it be that test scores show their students' mastery of reading skills having improved over a nine-month period.
should it be that test scores show their students' mastery of reading skills having
should it be that test scores show their students' mastery of reading skills have
should test scores showing their students' mastery of reading skills has
if test scores showing their students' mastery of reading skills having
if test scores show that their students' mastery of reading skills has
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2、if引导的条件不可能发生的，用虚拟语气，强调过去没有发生用if past perfect(had done), then conditional perfect(would have done)；强调现在不可能发生用if past, then past future(would do)，或 if were to, then past future；强调未来不可能发生用if should do, then past future。
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