问题
选择题
. A new technique ____, the production as a whole increased by % percent last year.
A．employing
B．having employed
C．to have been employed
D．having been employed
答案
答案：D
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. A new technique ____, the production as a whole increased by % percent last year.
A．employing
B．having employed
C．to have been employed
D．having been employed
答案：D