24. When_________why he was late, he made no answer.
A.questioned B.questioning
C.asking questions D.question?
高中必刷題系列答案科目：高中地理 來源： 題型：
---Spacecraft “Discovery” has failed in the course of launch.
----_______? They have been preparing for the test.
A. How come B. When C. How D. Why not
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