—Daviddidn’ttakepartinthevolleyballmatchlastnight.—Yes....

來源：國語幫 8.82K

—David didn’t take part in the volleyball match last night.

— was________he had injured his foot in the training.

A．why B．because

C．whether D．what

B　考查表語從句。根據對話提供的情景，上句“沒有參加比賽”是結果，下句“他在訓練中腳受傷了”是原因，故用because引導表語從句。That is because...那是因為……，because後接原因；That is why...那是……的原因，why後接結果。