--- When did it begin to snow? 

--- It started ____ the night.

A. at                               B. by                         C. from                             D. during

——When did it begin to snow?    ——It started ____ the night.

A. during   B. by   C. from   D. at

—When did it begin to snow?

—It started        the night.

A.during                      B.by                                   C.from                         D.at

——When did it begin to snow?    ——It started ____ the night.

A. during   B. by   C. from   D. at

—When did it begin to snow?

    —It started ____ the night.

    A. during     B. by     C. from     D. at