第21题: [填空题]______(不会用) a computer makes it more difficult for him to do his academic research. (use) 参考答案:Not being able to use/Being unable to use/Not knowing how to use 答案解析:
从语境看, 本空在句中作主语,因此“不会用”在这里要用。Not being able to use或Being unable to use,即用 be able to的动