—Do you know how to start the machine?
— ．I’m a green hand．
A. Not a clue
B. Exactly
C. By all means
D. Just so-so
网友回答
(答案→)A. Not a clue
B. Exactly
C. By all means
D. Just so-so
解析：考查交际用语，Not a clue 毫无线索，Exactly 确切地，By all means 务必，当然可以，Just so-so 就一般，句意：你知道如何启动这台机器吗？毫无线索，我是一个新手。故选A。