they went to Beijing ___ a bad time of yeara.in b.forc.at d.on

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theywenttoBeijing___abadtimeofyeara.inb.forc.atd.ontheywenttoBeijing___abadtimeofyeara.inb.forc.atd.

they went to Beijing ___ a bad time of yeara.in b.forc.at d.on
they went to Beijing ___ a bad time of year
a.in
b.for
c.at
d.on

they went to Beijing ___ a bad time of yeara.in b.forc.at d.on
c
在一年中最坏的时间他们去了北京

c. at在一年中坏的时间他们去了北京