______ is being studied now in that research center.

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问题 ______ is being studied now in that research center.

选项 A、That this is made from
B、What is this made from
C、This is made from
D、What this is made from

答案D

解析此空格处的成分为全句的主语，首先排除[C]项(没有引导词)；主语从句语序不倒装，排除[B]项；该主语从句的引导词同时在从句中做介词的宾语，而[A]项中连接词 that只能引导名词从句，但不能在从句中充当任何成分，故答案为[D]。

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