So far the exchange program has brought many foreigners to China　　.（　　） A.study B.to study C.stud...

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had been working;are still working had worked;were still working have been working;have worked have worked;are still working

had been working; are still working had worked; were still working have been working; have worked have worked; are still working

had worked ; come out have worked ; came out had been working ; have come out have been working ; have come out

As long as So far as As much as As soon as

had been working; are still working had worked; were still working have been working; have worked have worked; are still working

shortcomings expression contribution awareness

had been working; are still working had worked; were still working have worked; were still working have worked; are still working

study to study studying studied

had been working; are still working had worked; were still working have been working; have worked have worked; are still working

have worked had worked have been working had been working

had been working; are still working had worked; were still working have been working; have worked have worked; are still working

When What H

---Thank you. A. you to, on you will, in you to, in you will, on

had been working; are still working had worked; were still working have been working; have worked have worked; are still working

had been working; are still working had worked; were still working have been working; have worked have worked; are still working