how long _____ Li Lei ____ (be ) back from Shanghaii _____ (watch) lots of animal shows since i ____(come) to nanjing.

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how long _____ Li Lei ____ (be ) back from Shanghaii _____ (watch) lots of animal shows since i ____(come) to nanjing.

how long _____ Li Lei ____ (be ) back from Shanghaii _____ (watch) lots of animal shows since i ____(come) to nanjing.
how long _____ Li Lei ____ (be ) back from Shanghai
i _____ (watch) lots of animal shows since i ____(come) to nanjing.

how long _____ Li Lei ____ (be ) back from Shanghaii _____ (watch) lots of animal shows since i ____(come) to nanjing.
how long __has___ Li Lei __been__ (be ) back from Shanghai
i __have watched___ (watch) lots of animal shows since i _come__(come) to nanjing.

has been

will be , have watched, came