nO one knows ----how the robbery happened in this store last night.Maybe someone broke into the the store and robbed the valuble watches.A.to be sureB.make sure C.for sure 为什么?

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nO    one   knows  ----how the robbery happened in this store last night.Maybe someone broke into the the store and robbed the valuble watches.A.to be sureB.make sure C.for sure   为什么?

nO one knows ----how the robbery happened in this store last night.Maybe someone broke into the the store and robbed the valuble watches.A.to be sureB.make sure C.for sure 为什么?
nO one knows ----how the robbery happened in this store last night.Maybe someone broke into the the store and robbed the valuble watches.
A.to be sureB.make sure C.for sure 为什么?

nO one knows ----how the robbery happened in this store last night.Maybe someone broke into the the store and robbed the valuble watches.A.to be sureB.make sure C.for sure 为什么?
(A)和 (B)都有动词,所以不能接上前面的动词"knows",只有(C)作为状语时才能接得上

C
for sure 做状语