The products of the chemical industry make a major contribution to present-day standards of living, and life today______impossible without these products.
A．is
B．has been
C．would be
D．would have been

未分类题If John were to resign and if Henry were elected to take his place, we______ more vigorous leadership.A．have hadB．should have hadC．should haveD．had

未分类题Jenny Edward divulged her intention of trying vaccination under a bond of secrecy because she feared ridicule if they______.A．have failedB．should failC．failedD．being failed

未分类题If oil______on the frozen north coast in the 1960s, an 800-mile pipeline would not have been constructed to bring it to the south coast.A．was not discoveredB．was discoveredC．had not been discoveredD．had been discovered

未分类题She claimed that he______able to give more intimate details if he had been properly qualified.A．have beenB．should have beenC．wereD．should be

未分类题Letters of recommendation received after the first of the month will not be reviewed by the admissions officer______ to your file.A．assignedB．assigningC．being assignedD．to assigning