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A new theory ( ) before it can be put into practice.(本题分数:2

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A new theory ( ) before it can be put into practice.(本题分数:2 分.)
A new theory ( ) before it can be put into practice.(本题分数:2 分.)
A、 must be tested
B、 be tested
C、 can be tested
D、 to be tested
A new theory ( ) before it can be put into practice.(本题分数:2
A new theory ( A ) before it can be put into practice.(本题分数:2 分.)
A、 must be tested
B、 be tested
C、 can be tested
D、 to be tested