---How long have you known the doctor ? ---________

---How long have you known the doctor ?  ---_________he helped me three years ago.

#56019

When　

Before　

Because

Since

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Do you know the young lady _____ your mother is talking?

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who

whom

with whom

which

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are

and

but

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has; both; and

have; not only; but also

hasn’t; either; or

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