Our project must proceed at a reasonably quick tempo. Surely one month is ample time, ( )

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Our project must proceed at a reasonably quick tempo. Surely one month is ample time, ( )
A.isn't it
B.is it
C.it isn't
D.it is

本题关键词:僵a,ECF-A,EP21-A,EP6-A,EP18-A,EP7-A,Lp(a),Lp（a）,A-aDO2,抗A;