语法与词汇
14.
The board deemed it's urgent that these invitations_____first thing tomorrow morning.
A、
had to be put in the mail
B、
must be put in the mail
C、
be put in the mail
D、
should have been put in the mail
【正确答案】
C
【答案解析】
it is urgent that后接虚拟语气，即(should)+动词原形。
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