11. We have to accept the fact _____there is a shortage of qualified teachers in the countryside.
A、that
B、which
C、since
D、because
Directions:There are 15 incomplete sentences in this section. For each sentence there are four choices marked A, B, C and D. Choose one answer that best completes the sentenceand blacken the corresponding letter on the Answer Sheet.6–-Did you find the film boring?一-Not at all. It was _____