By the time Einstein was 14 years old, he ________ himself advanced mathematics.
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A
has taught
B
taught
C
had taught
D
was teaching
推荐题目
I saw Sue but she didn’t see me. She _______ the other way.
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A
was looking
B
looked
C
had looked
D
would look
Tom      me into giving up all plans for three weeks, but he failed at last.
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A
tried to persuade
B
had tried to persuade
C
persuaded
D
had persuaded
We ______ hurry because we still had a lot of time.
#100057
A
don't have to
B
needn't have to
C
didn't need
D
didn't have to