We are sure___he___to speak English wellA. that; learnedB. that; has learnedC. if; learnedD. if; has learned

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We are sure___he___to speak English well
A. that; learned
B. that; has learned
C. if; learned
D. if; has learned

都sure了显然不用if
选B. that; has learned

B
我们确信他能够讲一口流利的英语
be sure that 确信...
没有 be sure if 的句型

D 不解释