单项选择题
A．for the highest price offered B．only at fixed prices C．at a price less than their true value D．very cheaply
A．take care not to be over-critical in his writing B．watch carefully to see that nobody else takes his job C．be careful to ensure that his comments retain their value D．be sure that his salary keeps pace with inflation
A．Because he feels that he might be exaggerating B．Because he has recently praised more works than usual C．Because he finds it hard to be objective D．Because he feels he may not praise the work sufficiently