Having been familiar with his ability, ______.
A、the manager was assigned a challenging task
B、the manager assign a challenging task
C、the board assigned him a challenging task
D、a challenging task was assigned to the manager
【正确答案】：C
【题目解析】：be familiar with意为”对......熟悉“；选项A意为”经理被指派了一项具有挑战性的任务“，不符语境；根据前半句的having been familiar with可以判断后面主句的主语不能是task，故排除选项D；选项B意为”经理分配了一项具有挑战性的任务“，与前面半句并无关系，故可排除；选项C意为”董事会给他分配了一项具有挑战性的任务“，符合句意。
