题目内容
31．Every solid object______reflect a sound，varying according to the size and nature of the object．
A．must B．shall C．will D．Should
C
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31．Every solid object______reflect a sound，varying according to the size and nature of the object．
|
A．must |
B．shall |
C．will |
D．Should |
Every solid object ______ reflect a sound，varying according to the size and nature of the object．
| A．must | B．shall | C．will | D．should |