He has tried four times, but his teacher wants him to try ______ fifth time.
A. the                   B. a                            C. /
B
在英文中，不定冠詞+序數(shù)詞可以表示再一次的意思，本題的含義為他嘗試了四次，但是老師想讓他再嘗試一次，也就是嘗試第五次，故本題選B。
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