22. By the time                ，I will have finished reading  the book. (come)

到他回來時，我將讀完這本書了。

22. he comes back考查一般現(xiàn)在時表將來的用法。在主從復(fù)合句中，主句時態(tài)為將來時，從句時態(tài)應(yīng)用一般現(xiàn)在時表將來。在本句中，bythetime 引導(dǎo)的句子是從句，因此"回來"的時態(tài)應(yīng)是一般現(xiàn)在時表將來。

題目來源：高考丟分題英語 > 專題訓(xùn)練 2：時態(tài)和語態(tài)

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