she is going to tibet __vacation___December A for in B in in C for on D on on

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sheisgoingtotibet__vacation___DecemberAforinBininCforonDononsheisgoingtotibet__vacation___DecemberAf

she is going to tibet __vacation___December A for in B in in C for on D on on
she is going to tibet __vacation___December A for in B in in C for on D on on

she is going to tibet __vacation___December A for in B in in C for on D on on
A for in

When is she going to ...?

for ,in

选A。

a,for表示去台北的原因,而december只是月份,所以加in,如果是确切的某一天则加on

A
for vacation 度假 在某一月用in

b

A for vacation
in December...
月份前只能用in,但vacation前不可能用in

选A