Every solid object ______ reflect a sound，varying according to the size and nature of the object．
A．mustB．shallC．willD．should
C
每個(gè)固體物體都會(huì)反射出聲音，這根據(jù)物體的大小和本質(zhì)而不同。Shall 一般用于第一人稱。
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