I’m not sure if he ______ in this exam. But if he ______ harder, he will do better.
A．succeeds; worksB．will succeed; will work
C．will succeed; worksD．succeeds; will work
C

試題分析：句意:我不確定他是否能在這次考試中成功；但是如果他工作得更努力，他會做得更好。本句中兩個if 的意思并不一樣。第一個if 意為是否，引導賓語從句，根據(jù)句意可知，考試還沒進行，故用一般將來時；第二個if 意為如果，引導條件狀語從句，從句中用一般現(xiàn)在時，主句用將來時。故選C。
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