对检验不合格的焊缝必须返修至合格，返修次数不得大于（）次。
A.1
B.2
C.3
D.4
参考答案：B
Die Maus f hrt ______ Wagen.
Haven’t I told you I don’t want you keeping ______ with those awful riding-about bicycle boys
A. company B. acquaintance C. friends D. place
