题干
.
—Must I turn off the gas after cooking?
—Of course! You can never be__________careful with that.
—Must I turn off the gas after cooking?
—Of course! You can never be__________careful with that.
A：enough
B：too
C：so
D：very
答案(点此获取答案解析）
B
分子中，位于同一平面上的原子数最多可能是（ ）