He was seriously injured last week and that’s _______ he didn’t participate in the competition.
A．whenB．howC．whyD．what
C

試題分析：句意：上周他受傷嚴(yán)重，這就是他為什么不能參加比賽的原因。That’s why….這就是為什么。When什么時(shí)候，why為什么，what什么，都不符合句意，所以選C。
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