题干
.The old man said the accident ___________ carless driving, so a lot of money should be paid by the driver.
A：was due to
B：is due to
C：had due to
D：has due to
答案(点此获取答案解析）
A
达到平衡时，A，B和C的物质的量分别为4mol、2mol和4mol．保持温度和压强不变，对平衡混合物中三者的物质的量做如下调整，可使平衡右移的是（ ）