—Why didn’t Betty come to school yesterday?— she was ill. A. But B. ThoughC. IfD. Because

问题补充：

—Why didn’t Betty come to school yesterday?

— she was ill.

A. But

B. Though

C. If

D. Because

答案：

A. But

B. Though

C. If

(答案→)D. Because

解析：考查连词。But可是，但是；Though虽然，尽管；If如果，是否；Because因为。句意：昨天贝蒂为什么没来上学？结合下文她生病了。可知表示的是原因，故选D。