I ________ up to $5 000 by the time the new term begins in September.
A．have savedB．will have saved
C．will be savingD．had saved
B
B 考察動詞時態(tài)。句意：當九月份新學期開始時，我將會攢夠5000美元。By the time引導的是時間狀語從句，在時間狀語從句里，從句一般用現(xiàn)在時，主句使用將來時。同時by+時間，做時間狀語的時候，謂語動詞要使用完成時，因此本句話主句的謂語動詞應(yīng)該使用將來完成時。故B正確。
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