摘要：31． advertisements are of great help, I don’t think we should entirely rely on them. A．Since B．While C．Because D．As
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advertisements are of great help, I don’t think we should entirely rely on them.
| A．Since | B．While | C．Because | D．As |
_________ advertisements are of great help, I don’t think we should entirely rely on them.
| A．Since | B．While | C．Because | D．As |
________ advertisements are of great help, I don’t think we should entirely rely on them.
| A．Because | B．Since | C．Once | D．While |