______this difficulty is overcome, other problems will be easy to solve.
A．ForB．WhetherC．OnceD．Though
C
考查連詞，F(xiàn)or 因為，Whether 是否，Once 一旦，Though 雖然，句意：一旦這個困難被克服，其它的問題就容易解決了。所以選C。
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