Is this reason ________ at the meeting for his carelessness in his work?

[　　]

A．he explained

B．what he explained

C．how he explained

D．why he explained

Is this the reason _________ at the meeting for his carelessness in his work?

1. A.
   he explained
2. B.
   what he explained
3. C.
   how he explained
4. D.
   why he explained

Is this the reason ____at the meeting for his carelessness in his work?

A. why he explained      B. what he spoke   C. he explained     D. he spoke

Is this the reason _______ at the meeting for his carelessness in his work?

A. he explained

B. what he explained?

C. how he explained?

D. why he explained?

Is this the reason ___ at the meeting for his carelessness in his work?

     A.he explained   B.what explained   C.how he explained   D.why he explained