Allen has decided that he will be an engineer by the time he ________ twenty.
A．had beenB．is going to be
C．will beD．is
D
答案：D　考查考生對(duì)題干和動(dòng)詞時(shí)態(tài)的理解及掌握情況。句中by the time相當(dāng)于when，用來引出時(shí)間狀語從句，從句中需用一般現(xiàn)在時(shí)表將來，故選D。
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