By the end of last week, we _____ all the units in this book. A、 learned B、 have learned C、 had learned D、 would have learned

By the end of last week, we _____ all the units in this book.

A、
learned

B、
have learned

C、
had learned

D、
would have learned

出自：安徽工业大学大学英语1

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