I am in_____ charge of the class which was in     

charge of my wife.

A．不填；the

B．不填；不填

C．the; 不填

D．the; the

下列各组物质的晶体中，化学键类型相同、晶体类型也相同的是（   ）

A．SO₂和SiO₂

B．CCl₄和KCl

C．NaCl和HCl

D．CO₂和H₂O