返青期
参考答案:
秧苗移栽后,由于根系损伤,有一个地上部生长停滞和萌发新根的过程,约需5D、左右才恢复正常生长,称返青期。
-- I have got a headache.
-- No wonder. You_________ on the math exercises too long.
A.work
B.are working
C.have been working
D.worked
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