单选题：_______isthe custom, the investigators carried out a painsta

题目内容：

_______isthe custom, the investigators carried out a painstaking search of the debrisafter the air crash. A． What
B． As
C． Which
D． That

参考答案：

答案解析：

_______weare successful, we can be sure that we did our best

_______weare successful, we can be sure that we did our best.A．Provided that B．

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The experiment found that mice infected withtoxoplasma gondii_______.A． stayed f

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Anderson and Lynch put forward the three factorsthat affect the listening compre

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