Your _______ is very helpful．I guess I'll take it．（ ）
| A． |
secret |
B． |
advice |
C． |
promise |
D． |
purpose |
Your _______ is very helpful．I guess I'll take it．（ ）
| A． |
secret |
B． |
advice |
C． |
promise |
D． |
purpose |
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