.
--- I think this accident happened for many reasons.
--- Richard is partly to blame, __________way you look at it.
| A．what | B．which | C．whatever | D．whichever |
______ as the main reason for the recent world-wide economic problems is the fact that the US government would hardly accept.
| A．Regarding | B．To regard | C．Regarded | D．Being regarded |
The Apple Company had scarcely released i-Phone ______ it became one of the best-selling electronic products.
| A．than | B．before | C．while | D．when |
Electrolysis(电解)is the process ______ electric current is passed through a substance to cause a chemical charge.
| A．which | B．whose | C．to which | D．by which |
So much ______ by the poem for the Wenchuan earthquake that he decided to participate in the re-construction of the damaged region.
| A．did he move | B．he moved | C．was he moved | D．he was moved |
Scientists ______ SARS for several months before a major discovery was made in the field.
| A．had been studying | B．have been studying |
| C．have studied | D．are studying |