15. The guidelines were revised to ensure that all procedures ______ strictly followed, lest any deviation ______ the reliability of the findings.
(A)were / affected
(B)be / affect
(C)should be / affected
(D)are / affect
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統計: A(0), B(3), C(0), D(0), E(0) #3866629
統計: A(0), B(3), C(0), D(0), E(0) #3866629