问题

ee, I’m poor in physics and you arenot good at chemistry, and……— That’s _______ we should help each other

A:am working
B:had been working
C:have been working
D:was working

正确答案是：

同类题型

I first met John at my sister’s weddingHe _________ with the bridegroom at the time

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— Jenny, the main course tastes very delicious! — Pleased to hear you like it It’s nothing _____ but time [ ]