var sogou_param = new Array();sogou_param["pid"] = "yygrammar";sogou_param["ct"] = "context";sogou_param["fmt"] = "h_728_90";sogou_param["iw"] = "728";sogou_param["ih"] = "90";sogou_param["charset"] = "gb2312";sogou_param["c_bo"] = "FFFFFF";sogou_param["c_bg"] = "FFFFFF";sogou_param["c_li"] = "0055E5";sogou_param["c_te"] = "000000";sogou_param["c_bt"] = "000000";sogou_param["c_hl"] = 'FF0900';sogou_param["sv"] = "1";sogou_param["sl"] = '1';sogou_param["hl"] = '0';

 

(11)______ until the lights have turned to green.

A. Wait                             B. To wait

C. Waiting                        D. Having waited

(12) ______ the pieces of cloth with a loose stitch before finally sewing them together.

A. Join                              B. To join

C. Joining                          D. Joined

以下各题也应选A，因为填空句为祈使句(from http://yingyu.chazidian.com)：

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