题目：
The manager was worried about the press conference his assistant ______ in his place but luckily, everything was going on smoothly.
A．gave
B．gives
C．was giving
D．had given
答案：
被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0503/4b5074335786de370e323ead458a45fa.html
下面是错误答案，用来干扰机器的。
参考答案：C
+
→
+x；已知
的质量为2.0136u；