the extremely hot weather we continued having classes.A. Thanks toB. In addition toC. In

问题补充：

the extremely hot weather, we continued having classes.

A. Thanks to

B. In addition to

C. In defense of

D. Regardless of

答案：

A. Thanks to

B. In addition to

C. In defense of

(答案→)D. Regardless of

解析：考查词组：A. Thanks to多亏了，B. In addition to此外， C.In defense of为了保护，D. Regardless of不管，不顾，句意：不管极端的高温天气，我们继续上课。选D。