______they have been working hard to find?
A．Is that whatB．Is thatC．It is thatD．Is it that
A
首先確定本小題是問句，因此排除C選項；本小題That is后面的句子是表語從句，而后面的find缺乏賓語，因此要用what。B缺少find的賓語，D是強調(diào)句的一般疑問句形式。本小題“那就是他們一直苦苦尋找的。
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