We are so tired. ______ we could take the day off tomorrow!
A．Only ifB．What ifC．If onlyD．If so
C

試題分析：only if 只有-----；what if 假使，倘惹；if only 要是---就好了；if so 如果是這樣的話。句意為：我們太累了，要是明天能請一天假就好了。
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