问题
选择题
We didn't see Tom run in the race. That's _____ he hasn't recovered from his knee injury.[ ]
A. because
B. that
C. why
D. what
答案
答案：A
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We didn't see Tom run in the race. That's _____ he hasn't recovered from his knee injury.[ ]
A. because
B. that
C. why
D. what
答案：A