The comments the expert made ______ stock-market bothered him greatly, ______ him not fall asleep all night. A.concerning, making B.be concerned, which made C.concerned, making D.to be concerning, made
【单选题】L-Glutamate dehydrogenase (Mr 330,000), present in the mammalian mitochondrial matrix, is the only enzyme that can use either __________________ as the acceptor of reducing equivalents.