题目内容

_____caused the accident has not yet been found.

A. Which
B. Whichever
C. What
D. Whatever

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I think it advisable that an armed guard_____in readiness.

A. is standing
B. will stand
C. stands
D. stand

Child_____he was, he knew that was the right thing to do.

A. as
B. who
C. that
D. like

试述六腑之间的关系。

根据陈建军教授所讲，改换能源结构，大量地利用石油、天然气，利用核能，这是我国中短期的能源改造的策略。()