第16题: [单项选择]They will not start the project until the board chairman ______ back from South Africa. A. will come B. is coming C. came D. comes 参考答案:D 答案解析:[解析] 本题考查从句时态用法。在not...until...结构中,当主句用一般将来时,until引导的从句,用一般现在时。所以D项为正确答案。
[用法拓展] 在由if, unless,suppo