4．Perhaps it will be a long time from abroad． A．when Tom comes back B．when Tom will co——青夏教育精英家教网—

摘要：4．Perhaps it will be a long time from abroad． A．when Tom comes back B．when Tom will come back C．before Tom comes back D．that Tom comes back

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－Do you know when Tom ________ back from abroad?

－Perhaps it will be a long time before he ________back．

A．will come; will come

B．comes; will come

C．will come; comes

D．comes; comes

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