单选题 During the Roman Republic around 50 BC, to protect the grain trade, heavy fines were imposed on anyone directly, deliberately, they insidiously stopped supply ships.

A、 comma splice
B、 correct
C、 choppy
D、 run on

【正确答案】 A

【答案解析】[解析] they insidiously stopped supply ships和前面heavy fines were imposed on anyone directly, deliberately是两个独立的句子，这里不能直接用逗号把二者连接起来。