单选题
The only thing (what) really matters (to) the children (is) (how soon) they can return to their uncle's farm.
A、
what
B、
to
C、
is
D、
how soon
【正确答案】
A
【答案解析】
what＝sth that……，先行词和定语从句引导词可以用 what替代，本句可改为what really matters/the only thing that matters
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