The teacher spoke()so the students could hear him clearly .

问题描述:

The teacher spoke()so the students could hear him clearly .
A loud
B loudly
C aloud

应该选择B.loud 意为“响亮地”、“大声”或“高声地”,侧重发出的音量大,传得远,一般多用来修饰 speak , talk , laugh 等动词
为什么不选Aloud 意为“响亮地”、“大声”或“高声地”,侧重发出的音量大,传得远,一般多用来修饰 speak , talk , laugh 等动词。 loud 还可用作形容词。例如:

Speak louder, please, or no one will hear you.

请大声些,否则没人能听见。

loudly 意为“响亮地”是副词,其基本意义与 loud 相同,还常与 ring , knock 等动词连用。 loudly 放在动词前后均可,含有“喧闹”或“嘈杂”的意味。例如:

Suddenly the bell on the wall rang loudly.

突然,墙上的铃大声地响起来。
loudly只能用作副词;loud既可作副词,也可用作形容词。当副词用时,loudly与loud一样用来说明声音的强度,意思是"高声地,喧噪地",